What would Marissa Cooper think?

Mischa Barton took a break from filming "Zombie Killers: Elephant's Graveyard" (yes, that's an actual movie) to attend the opera in New York on Monday looking worlds away from her former "The O.C" days.

Barton, who has been in a style rut for the past few years (we can't get the image of her in those '70s mom jeans out of our head) actually took a fashion step forward in a black Valentina Kova robe dress which featured a blue belt and a thigh-high slit.

But who cares about the dress when there are fab accessories? The former "The Beautiful Life: TBL" star outdid herself by holding on to a showstopping feather clutch which would make birds cower.

So does this gorgeous ensemble wash away her former style sins? No, but the London-born actress has recently been attempting a style comeback with some success.

Blake Lively's predecessor sported an elegant white off-the-shoulder Temperley London gown earlier this year and turned heads in a sheer feathered frock at the 2011 Shanghai Film Festival.

But we still miss the good ol' days when "Coop" was the reigning fashion powerhouse of the early aughts. (Who could forget the drop waist satin dress she sported when walking down the runway hoping to impress Ryan Atwood?)

mischa barton

Look how cute she was with Hayden Christensen in 2005!

mischa barton

We miss you, "The O.C."!

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  • The O.C.

    UNSPECIFIED - MARCH 08: Full shot of cast on beach: Adam Brody as Seth, Rachel Bilson as Summer, Benjamin McKenzie as Ryan, Mischa Barton as Kirsten, Peter Gallagher as Sandy, Kelly Rowan as Kirsten, Alan Dale as Caleb, Tate Donovan as Jimmy and Melinda Clarke as Julie. (Photo by Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - MARCH 09: Medium shot of Peter Gallagher as Sandy, Adam Brody as Seth and Benjamin McKenzie as Ryan. (Photo by Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot of Rachel Bilson as Summer and Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium profile shot in restaurant of Billy Campbell as Carter sitting at table with Kelly Rowan as Kirsten. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot of Olivia Wilde as Alex lying on couch. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot in shopping mall of Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Full profile shot of Olivia Wilde as Alex talking with Mischa Barton as Marissa. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot of Mischa Barton as Marissa talking on cell phone. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot of Rachel Bilson as Summer kissing Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot in shopping mall of Mischa Barton as Marissa standing at cosmetics counter with Rachel Bilson as Summer, each wearing hockey mask and holding hockey stick. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - MARCH 09: Medium low-angle shot in shopping mall of Adam Brody as Seth and Benjamin McKenzie as Ryan, each wearing hockey mask and holding hockey stick. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - MARCH 09: Full shot in shopping mall of Adam Brody as Seth, Rachel Bilson as Summer, Mischa Barton as Marissa and Benjamin McKenzie as Ryan. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - MARCH 09: Medium shot of Olivia Wilde as Alex (left) facing Mischa Barton as Marissa. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - MARCH 09: Medium shot of Rachel Bilson as Summer. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - FEBRUARY 15: Medium shot of Mischa Barton as Marissa holding clipboard and standing on beach with others holding shovels. (Photo by Greg Schwartz/Warner Bros./Getty Images)

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    UNSPECIFIED - FEBRUARY 15: Medium profile shot of Mischa Barton as Marissa and Olivia Wilde as Alex; both seated on rocks on beach. (Photo by Greg Schwartz/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Shannon Lucio as Lindsay and Kelly Rowan as Kirsten. (Photo by Justin Lubin/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Alan Dale as Caleb. (Photo by Justin Lubin/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Peter Gallagher as Sandy and Kelly Rowan as Kirsten. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Michael Cassidy as Zach and Rachel Bilson as Summer. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Olivia Wilde as Alex, Adam Brody as Seth and Kelly Rowan as Kirsten. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Peter Gallagher as Sandy. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Kelly Rowan as Kirsten. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Adam Brody as Seth wearing Spider-man mask and hanging upside down, kissing Rachel Bilson as Summer. (Photo by Justin Lubin/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Shannon Lucio as Lindsay and Benjamin McKenzie as Ryan. (Photo by Justin Lubin/Warner Bros./Getty Images)

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    UNSPECIFIED - JANUARY 20: Full shot of Benjamin McKenzie as Ryan and Adam Brody as Seth. (Photo by Justin Lubin/Warner Bros./Getty Images)

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    UNSPECIFIED - JANUARY 20: Medium shot of Benjamin McKenzie as Ryan, Mischa Barton as Marissa, Peter Gallagher as Sandy, Kelly Rowan as Kirsten and Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Mischa Barton as Marissa and Tate Donovan as Jimmy. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - SEPTEMBER 07: Full publicity shot of (from left) Adam Brody as Seth, Rachel Bilson as Summer, Peter Gallagher as Sandy, Kelly Rowan as Kirsten, Alan Dale as Caleb, Melinda Clarke as Julie, Mischa Barton as Marissa, Benjamin McKenzie as Ryan, and Tate Donovan as Jimmy. (Photo by Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Peter Gallagher as Sandy, Shannon Lucio as Lindsay, Michael Cassidy as Zach and Rachel Bilson as Summer. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Peter Gallagher as Sandy singing. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Benjamin McKenzie as Ryan, Kelly Rowan as Kirsten, and Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Medium shot of Mischa Barton as Marissa and Melinda Clarke as Julie. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 19: Medium shot of Olivia Wilde as Alex. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 20: Full shot of (from left) Peter Gallagher as Sandy, Rachel Bilson as Summer, Mischa Barton as Marissa, Michael Cassidy as Zach, Olivia Wilde as Alex, Adam Brody as Seth, Kelly Rowan as Kirsten, Benjamin McKenzie as Ryan, and Shannon Lucio as Lindsay. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 05: Medium shot of Benjamin McKenzie as Ryan and Adam Brody as Seth. (Photo by Justin Lubin/Warner Bros./Getty Images)

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    UNSPECIFIED - JANUARY 19: Medium shot of Tate Donovan as Jimmy and Kelly Rowan as Kirsten. (Photo by Richard Foreman/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 05: Medium shot of Kim Delaney as Rebecca and Barry Newman as Professor Bloom. (Photo by Justin Lubin/Warner Bros./Getty Images)

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    UNSPECIFIED - JANUARY 05: Medium shot of Peter Gallagher as Sandy and Kelly Rowan as Kirsten. (Photo by Justin Lubin/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 29: Medium shot of Benjamin McKenzie as Ryan and Adam Brody as Seth. (Photo by Richard Foreman/Warner Bros./Getty Images)

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    UNSPECIFIED - NOVEMBER 29: Medium shot of Benjamin McKenzie as Ryan and Adam Brody as Seth. (Photo by Patrick Ecclesine/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 29: Medium shot of Olivia Wilde as Alex and Mischa Barton as Marissa. (Photo by Justin Lubin/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 29: Full shot of Rachel Bilson as Summer and Kelly Rowan as Kirsten. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 29: Medium shot of Emmanuelle Chriqui as Jody and Olivia Wilde as Alex. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - JANUARY 18: Full publicity shot of Rachel Bilson as Summer, Adam Brody as Seth, Benjamin McKenzie as Ryan and Mischa Barton as Marissa. (Photo by Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 08: Full shot of Adam Brody as Seth, Shannon Lucio as Lindsay, Kelly Rowan as Kirsten and Peter Gallagher as Sandy in front of house. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 08: Medium shot of Benjamin McKenzie as Ryan. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 08: Medium shot of Shannon Lucio as Lindsay and Benjamin McKenzie as Ryan. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - NOVEMBER 08: Full shot of Adam Brody as Seth and Rachel Bilson as Summer. (Photo by Darren Michaels/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - OCTOBER 18: Medium shot of (from left) Mischa Barton as Marissa, Rachel Bilson as Summer, Adam Brody as Seth, and Benjamin McKenzie as Ryan. (Photo by Carol Kaelson/Warner Bros./Getty Images)

  • The O.C.

    UNSPECIFIED - OCTOBER 04: Full publicity shot of (from left, back) Tate Donovan as Jimmy, Melinda Clark as Julie, Peter Gallagher as Sandy, Mischa Barton as Marissa, Benjamin McKenzie as Ryan, Alan Dale as Caleb and Kelly Rowan as Kirsten, and (front) Adam Brody as Seth and Rachel Bilson as Summer. (Photo by Warner Bros./Getty Images)

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