Rihanna

The mega-star looked lovely in lilac as a bridesmaid in assistant Jennifer Rosales' Hawaiian wedding on April 20, 2015.

The 28-year-old had a blast goofing off with her good pal before the ceremony, but got serious when posting a picture of the happy couple, writing, "Perfection."

Speaking of 4/20…it looks like the singer may also be celebrating ANOTHER occasion, if you catch our drift (aka Weed Day).

Jennifer Aniston

In November 2002, Brad Pitt accompanied his then wife to the wedding of friend Andrea Buchanan at the home of singer Sheryl Crow in Hollywood.

We’re just not too sure about that maroon number…

Kim Kardashian

Hey, it’s only fair Kim returns the favor since her friends and family have been part of her three weddings!

The brunette bombshell put her curves on display in this purple floor-length mermaid dress for sister Khloé Kardashian’s nuptials to Lamar Odom in September 2009.

Pippa Middleton

Perhaps the most famous bridesmaid of them all!

Pippa turned heads in a figure-hugging number by Sarah Burton for Alexander McQueen at sister Kate Middleton and Prince William’s April 2011 wedding.

"As I have found out, recognition has its upside, its downside and—you may say—its backside,” she said about the famous ensemble.

Jessica Biel

The actress attended the wedding of 7th Heaven costar Beverly Mitchell and Michael Camero in Ravello, Italy in October 2008.

She served as bridesmaid in this brown strapless dress – and showed off her killer arms! Her best accessory? Now-husband Justin Timberlake.

Jessica Simpson

Before she was BFF CaCee Cobb’s maid of honor in 2012…

Jessica Simpson

…she was a bridesmaid at friend Jennifer Joy MacFarlane’s nuptials in Beverly Hills in October 2004. Nick Lachey, her former husband, was her date at the time.

Vanessa Hudgens

The 27-year-old proudly supported her BFF Ashley Tisdale as a bridesmaid when the actress wed musician Christopher French on Sept. 8, 2014, in LA.

Jennifer Lawrence

J-Law sure does make one beautiful bridesmaid! The Oscar winner, 25, was part of the bridal party for her older brother Blaine’s wedding to now-wife Carson Massler.

The bride and bridesmaids were featured on a special issue of Martha Stewart Real Weddings. The actress looked gorgeous in an off-white, J. Crew strapless dress as she posed alongside the party.

Blaine and Carson said “I Do” in the star’s native state of Kentucky at Hermitage Farm in October 2013.

Taylor Swift

The 26-year-old stunned as the maid of honor in the wedding of two childhood friends, Britany Maack and Benjamin LaManna, in February 2016.