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Rachel McAdams Makes The Most Beautiful Bridesmaid At Sister's Wedding

And she's wearing something blue!

She may have played a bridesmaid in "Wedding Crashers," but Rachel McAdams reprised the role in real life for her sister Kayleen's wedding ceremony in Muskoka over the weekend.

For the occasion, the 36-year-old Canadian actress donned a beautiful knee-length cornflower blue halter dress by Zimmerman, which featured a draped, petal-style skirt. She paired the frock with Christian Louboutin stilettos. Her short locks were left down in loose curls and her makeup kept to a minimum.

Kayleen, who is a Los Angeles-based celebrity makeup artist, wore an ivory, lace halter gown with a mermaid-style skirt and a veil. The other bridesmaids wore various styles of mid-length dresses in cream, white, lilac and blue.

A source told Us Weekly the entire wedding weekend was "emotional" for the family, with Rachel wiping away tears with tissue during the ceremony.

Too sweet! Congrats to the happy couple!

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