Not even movie vampires are immortal.

"Twilight" star Kristen Stewart celebrates her 23rd birthday on April 9 and we can bet she will probably be wearing her trademark Converse sneakers, an old grey-tee tied up around the waist, skinny jeans and messy hair.

Not that boyfriend, (and fellow "Twilight" vampire) Robert Pattinson will mind!

The highest-paid movie couple were recently spotted in Los Angeles being touchy-feely, putting rumours that the couple have split to rest. (The couple briefly broke up last summer when Kristen's affair with her "Snow White and the Huntsman" director Rupert Sanders was revealed.)

Not that Kristen is spending all her time with Pattinson; the "On The Road" star was recently at the Kids' Choice Awards hanging out with friends (and on Katy Perry's lap) looking ever-so-chic in a polka dot outfit.

Kristen cleans herself up nice when she's not hiding under a baseball cap, right?

So, in honour of her birthday, we take a look at her style evolution.

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  • Kristen Stewart

    Only KStew can make shiny polka dot short shorts look hot.

  • Kristen Stewart

    KStew doesn't look too impressed with her white lace and tulle gown while attending the 85th Annual Academy Awards. It might be because she <a href="http://www.huffingtonpost.com/2013/02/24/kristen-stewart-crutches-oscars_n_2756172.html?utm_hp_ref=kristen-stewart" target="_blank">injured her foot</a> and had to wear crutches.

  • Kristen Stewart

    No one can make this seafoam green satin mess look good. Sorry KStew!

  • Kristen Stewart

    Shorts again? We see a trend happening...

  • Kristen Stewart

    Lace shorts!

  • Kristen Stewart

    This top and skirt combo is subtle yet glamorous. Perfect for Kristen's laid-back style.

  • Kristen Stewart

    We like the metallic gold but the vertical lines distort her body.

  • Kristen Stewart

    If you can recover from the eye-burning brightness of this dress, you will see a really cute, flattering outfit.

  • Kristen Stewart

    What Is KStew doing wearing a body-con dress? It's just not her style.

  • Kristin Stewart

    Kristen Stewart, former "Dynasty" cast-member.

  • Kristen Stewart

    We bet Kristen used this see-through dress to make it up to Robert Pattinson after her affair with her "Snow White" director.

  • Kristen Stewart

    It's punk, it's chic and she looks smokin'.

  • Kristen Stewart

    So that's where our square-patterned kicks from the '90s ended up.

  • Kristen Stewart

    This was Kristen's first red carpet appearance since the news broke of her affair with her "Snow White" director, Rupert Sanders. She looked confident and ready to slay the world with her iron stare at the Toronto International Film Festival, Sept. 2012.

  • Kristen Stewart

    This mini dress is pure '70s disco glam. Love it.

  • Kristen Stewart

    A modern-take on masculine dressing: a blazer and high-collared blouse paired with a pleated mini skirt and heels is super chic.

  • Kristen Stewart

    Leather. That's all one really needs.

  • Kristen Stewart

    Lace lavender. How old is Kristen, 60?

  • Larry Busacca/Getty Images

    There are too many trends happening here: colour blocking, leather skirts and dramatic prints. It's overwhelming.

  • Larry Busacca/Getty Images

    The column dress fits her well but the pattern screams grandma's drapes.

  • Kristen Stewart

    This dress would have worked if the shoulder wasn't so pointy.

  • Kristen Stewart

    Sexy grunge.

  • Kristen Stewart

    What is growing out of Kristen's dress? Somebody chop it off.

  • Kristen Stewart

    The colour rocks but the fit is so unflattering.

  • Kristen Stewart

    Scrunchy satin and sparkling sheer never mix.

  • Kristen Stewart

    This is probably the most mainstream glamorous gown that Kristen has ever worn.

  • Kristen Stewart

    We are obsessed with her yellow quilted motorcycle jacket and floral pants.

  • Kristen Stewart

    If we were wearing this horrendous dress, we would slump our shoulders too.

  • Kristen Stewart

    She has a bit of a marionette look going on and we love it.

  • Kristen Stewart

    A dress with this much detail and embroidery calls for a very bare face and no accessories. You did well, KStew.

  • Kristen Stewart

    It's watercolour chic.

  • Kristen Stewart

    It's hard to tell where Kristen's dress begins because it blends right into the red carpet. Not cool.

  • Kristen Stewart

    Those digital floral pants are everything.

Also on HuffPost:

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  • Kristen & Rob

    Actors Taylor Lautner, Kristen Stewart, and Robert Pattinson accept the Ultimate Choice award onstage during the 2012 Teen Choice Awards at Gibson Amphitheatre on July 22, 2012 in Universal City, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson (L) and Kristen Stewart speak at 'The Twilight Saga: Breaking Dawn Part 2' Panel during Comic-Con International 2012 at San Diego Convention Center on July 12, 2012 in San Diego, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Robert Pattinson and Kristen Stewart attend the UK premiere of The Twilight Saga: Breaking Dawn Part 1 at Westfield Stratford City on November 16, 2011 in London, England. (Photo by Ian Gavan/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson and Kristen Stewart arrive at the Premiere of Summit Entertainment's 'The Twilight Saga: Breaking Dawn - Part 1' at Nokia Theatre L.A. Live on November 14, 2011 in Los Angeles, California. (Photo by Jason Merritt/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson (L) and Kristen Stewart are immortalized in a hand and footprint ceremony at the Grauman's Chinese Theatre on November 3, 2011 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Actor Taylor Lautner, actress Kristen Stewart and actor Rob Pattinson attend the Summit Entertainment 'The Twilight Saga: Breaking Dawn - Part 1' press conference at the Hilton Bayfront during Comic-Con 2011 on July 21, 2011 in San Diego, California. (Photo by Michael Buckner/Getty Images for Summit Entertainment)

  • Kristen & Rob

    Actors Robert Pattinson (L) and Kristen Stewart arrive at Summit Entertainment's 'The Twilight Saga: Eclipse' at L.A. Live's Nokia Theater on June 24, 2010 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Robert Pattinson and Kristen Stewart accept the Best Kiss Award onstage at the 2010 MTV Movie Awards held at the Gibson Amphitheatre at Universal Studios on June 6, 2010 in Universal City, California. (Photo by Christopher Polk/Getty Images)

  • Kristen & Rob

    Actors Kristen Stewart (L) and Robert Pattinson arrive at the afterparty for the premiere of Summit Entertainment's 'The Twilight Saga: New Moon' at the Hammer Museum on November 16, 2009 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson and Kristen Stewart chat during the presentation of their new film 'The Twighlight Saga - New Moon' during the HVB youth event at the Olympic Hall on November 14, 2009 in Munich, Germany. (Photo by Alexandra Beier/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson (L) and Kristen Stewart appear onstage at Summit's 'The Twilight Saga: New Moon' Cast Tour at Hollywood and Highland on November 6, 2009 in Los Angeles, California. (Photo by Kevin Winter/Getty Images)

  • Kristen & Rob

    Actors Taylor Lautner, Kristen Stewart and Robert Pattinson speak at 'The Twilight Saga: New Moon' press conference during Comic-Con 2009 held at San Diego Convention Center on July 23, 2009 in San Diego, California. (Photo by John Shearer/Getty Images)

  • Kristen & Rob

    Actress Kristen Stewart (L) and actor Robert Pattinson, winners of Best Movie, Best Kiss, Best Fight, Best Female Performance, Breakthrough Male Performance awards for 'Twilight' pose in the press room during the 18th Annual MTV Movie Awards held at the Gibson Amphitheatre on May 31, 2009 in Universal City, California. (Photo by Jason Merritt/Getty Images)

  • Kristen & Rob

    American actress Kristen Stewart (L) and British actor Robert Pattinson pose for photographs during the 'Twilight' press conference at Ebisu Garden Place on February 27, 2009 in Tokyo, Japan. The film will open in Japan on April 4. (Photo by Kiyoshi Ota/Getty Images)

  • Kristen & Rob

    Actor Robert Pattinson (L) and Actress Kristen Stewart (R) arrive to attend a photocall for the Catherine Hardwicke's film 'Twilight' on December 8, 2008 at the Crillon Hotel in Paris, France. (Photo by Pascal Le Segretain/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson and Kristen Stewart attends the premiere of Summit Entertainment's 'Twilight' at The Mann Village and Bruin Theatres on November 17, 2008 in Westwood, California. The film is based on the popular book series by author Stephanie Meyer. (Photo by Vince Bucci/Getty Images)

  • Kristen & Rob

    Actors Robert Pattinson and Kristen Stewart attend the 'Twilight' Premiere during the 3rd Rome International Film Festival held at the Auditorium Parco della Musica on October 30, 2008 in Rome, Italy. (Photo by Franco Origlia/Getty Images)