Many celebrities have walked down the aisle without saying "I do," including all the stars that slipped on bridesmaid dresses over the years. Cameron Diaz , Britney Spears , Jennifer Garner , and more have shown their support for their closest pals and loved ones on their wedding  day. Click through to see all of the snaps of your favorite stars as bridesmaids, and in the spirit of wedding  season, be sure to take a look at our ultimate celebrity wedding  gallery too!
Sarah Michelle Gellar  wore pink as a bridesmaid in her pal's August 2006 wedding  in Santa Monica.
Maggie Gyllenhaal , along with her brother Jake Gyllenhaal , wore leis at their father's Hawaiian wedding  party in July 2011.
Kim Kardashian  wore purple as a bridesmaid for sister Khloé Kardashian's wedding  to Lamar Odom at a mansion in Beverly Hills in September 2009.
Ali Larter  mixed in with the bridal party at Amy Smart and Carter Oosterhouse's fete in September 2011 in Traverse City, MI.
In November 2007, Mary-Kate Olsen  and Ashley Olsen  both donned white as bridesmaids for a friend's beach wedding  in Cabo.
Jennifer Garner  led the way for the bridal party during an October 2006 event in Montecito.
Ashlee Simpson  walked down the aisle as a pal said "I do" in Palm Springs in March 2012.
Jessica Simpson  walked down the aisle with Zach Braff  at pal CaCee Cobb's LA wedding  to Donald Faison in December 2012.
Jessica Biel  showed support as a bridesmaid at her 7th Heaven costar Beverly Mitchell's big day in Italy in October 2008. She had now-husband Justin Timberlake  by her side for the bash.
Rachel Bilson  was part of Josh Schwartz and Jill Stonerock's big day at a Santa Barbara ranch in September 2008.
Naomi Watts  carried a bouquet alongside the bride, Emma Cooper, at the December 2010 nuptials in Sydney, Australia.
Selena Gomez  posed for a photographer at her friend's Mexico beach nuptials in December 2011.
Jessica Alba  was a bridesmaid and Cash Warren the best man for their pals' Beverly Hills wedding  in September 2010.
Katherine Heigl  stood by her sister Meg Heigl's side as a bridesmaid at her October 2007 nuptials in Santa Monica.
Eva Longoria  was a bridesmaid at the wedding  of her friend Amber Ridinger to Duane Mclaughlin at the Ritz-Carlton Dorado Beach in Puerto Rico, also attended by Khloé Kardashian and La La Vasquez.
Britney Spears  wore blue for a Miami ceremony in January 2011.
Katharine McPhee played bridesmaid at her sister Adrianna's LA wedding  in June 2012.
A pregnant Jessica Simpson  donned a bridesmaid dress for her friend's March 2012 wedding  in Palm Springs.
Cameron Diaz  traveled to the South of France to be a bridesmaid for a friend's wedding  in July 2006.
Keira Knightley  got together with her new sister-in-law after the April 2011 wedding  ceremony in Glasgow.
Kim Kardashian  had the support of her sisters Kourtney and Khloé at her August 2011 Montecito wedding  to Kris Humphries.
Brad Pitt  showed support for Jennifer Aniston  as a bridesmaid in a friend's LA wedding  in November 2002.
Tori Spelling  was honored as a bridesmaid on her friend's big day, which took place in Beverly Hills in January 2011.
Kate Bosworth  shared a moment with the bride at a March 2008 wedding  in Sydney.
Jessica Simpson  was one of multiple maids at a pal's Beverly Hills nuptials in October 2004.
Kirsten Dunst  held a bouquet at her friend Molly's July 2012 wedding  in Santa Barbara.
Pippa Middleton helped younger bridesmaids down the aisle at her sister Kate Middleton's London wedding  to Prince William in April 2011.
Ashley Greene  stepped into bridesmaid duties for her friend's wedding  in 2013.
Source: Instagram user makeupqueennyc 
Brooklyn Decker got goofy in a group snap during her pal's wedding .
Source: Instagram user brooklynddecker 
Adam Brody  and Ashlee Simpson  were just a few of the celebs in the wedding  party at a Palm Springs bash in March 2012.