Rachel McAdams is the ultimate maid of honor

Before you go, we thought you'd like these...
Before you go close icon
13 PHOTOS
Rachel McAdams bridesmaid
See Gallery
Rachel McAdams is the ultimate maid of honor
Actress Rachel McAdams attends the premiere of "A Most Wanted Man" at the Museum of Modern Art on Tuesday, July 22, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
Actress Rachel McAdams attends the premiere of "A Most Wanted Man" at the Museum of Modern Art on Tuesday, July 22, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
Rachel McAdams attends The Metropolitan Museum of Art's Costume Institute benefit gala celebrating "Charles James: Beyond Fashion" on Monday, May 5, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
Rachel McAdams attends The Metropolitan Museum of Art's Costume Institute benefit gala celebrating "Charles James: Beyond Fashion" on Monday, May 5, 2014, in New York. (Photo by Evan Agostini/Invision/AP)
Cast member Rachel McAdams poses at the premiere of the film "A Most Wanted Man" during the 2014 Sundance Film Festival, on Sunday, Jan. 19, 2014, in Park City, Utah. (Photo by Danny Moloshok/Invision/AP)
MUNICH, GERMANY - AUGUST 10: Actress Rachel McAdams poses at the red carpet during the Universal Open Air Film Lounge with the special screening of 'Alles eine Frage der Zeit' at the Kino am Olympiasee on August 10, 2013 in Munich, Germany. (Photo by Hannes Magerstaedt/Getty Images)
LONDON, ENGLAND - AUGUST 08: Actress Rachel McAdams attends the 'About Time' world premiere at Somerset House on August 8, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images for Universal Pictures)
LONDON, ENGLAND - AUGUST 08: Actress Rachel McAdams attends the 'About Time' world premiere at Somerset House on August 8, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images for Universal Pictures)
LONDON, ENGLAND - AUGUST 08: Actresses Margot Robbie and Rachel McAdams attend the 'About Time' world premiere at Somerset House on August 8, 2013 in London, England. (Photo by Gareth Cattermole/Getty Images for Universal Pictures)
TORONTO, ON - SEPTEMBER 10: Actress Rachel McAdams attends the 'To The Wonder' premiere during the 2012 Toronto International Film Festival at the Princess of Wales Theatre on September 10, 2012 in Toronto, Canada. (Photo by Jason Merritt/Getty Images)
WEST HOLLYWOOD, CA - APRIL 09: Actress Rachel McAdams attends the premiere of Magnolia Pictures' 'To The Wonder' at Pacific Design Center on April 9, 2013 in West Hollywood, California. (Photo by Jason Merritt/Getty Images)
of
SEE ALL
BACK TO SLIDE
SHOW CAPTION +
HIDE CAPTION


Like so many over Memorial Day weekend, Rachel McAdams participated in a family wedding.

The Aloha actress was the maid of honor to her younger sister, Kayleen, and just like in every romantic movie she's been in, the gal was filled with emotion.

An eyewitness tells ET that Rachel laughed and cried a few tears during her sibling's big day. The source also says she looked genuinely happy for her sister and was a dutiful maid of honor who tended to the bride's needs, including holding her bouquet during the ceremony, making sure the wedding dress was in perfect form and fetching a handbag before the post-ceremony photos.

PHOTOS: Famous and Fabulous Celebrity Bridesmaids

Hmm, will Kayleen repay the maid of honor duty for Rachel soon? After all, the 36-year-old beauty was recently rumored to be dating her Southpaw co-star Jake Gyllenhaal. But alas, Gyllenhaal told Ellen DeGeneres while appearing on her show last month that he's single "for now."

PHOTOS: On-Screen to Real Life Romance

So while we continue to hold out hope that we'll someday see photos of Rachel as a blushing bride herself, take a look at her sister and you'll see a striking resemblance.

Simply stunning!

Check out the video below to see Bradley Cooper talk about his great chemistry with McAdams.

Read Full Story

From Our Partners