Actress Rachel McAdams played a supporting role as her sister Kayleen tied the knot in Canada on the weekend.

Instagram/ Susan Anderson

IN PICTURES: CELEBRITY BRIDESMAIDS

The 36-year-old star looked every inch the perfect maid of honour, wearing a draped blue halterneck dress and strappy metallic heels.

FIND THE PERFECT GOWN FOR YOUR 'MAIDS

The Daily Mail has published photographs of Rachel, who was an onscreen 'maid in the 2005 film Wedding Crashers, smiling as she watched the ceremony conducted by a female priest. Rachel was also snapped dabbing away tears with a tissue - how adorable!

The bride, who looks remakably similar to her older sister in this Instagram snap, is believed to have worn this gown from Vera Wang's spring 2014 collection - sans peplum! We love the delicate lace insert. Very pretty, no?

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Congratulations Kayleen!