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As Rihanna performs her duties as a bridesmaid for her assistant, we take a look at other stars who have supported friends and family on their special day.
The 27-year-old looks gorgeous in a Spring-esq gown at her assistant's wedding in Honolulu. Picture: Splash
The two ladies look almost identical in their matching green dresses and with their hair twisted up in pretty curls. Picture: Instagram
Lady Gaga traded in her usual provocative stage outfits for a more demure look as she donned a pale pink bridesmaids dress for her best friend Bo's wedding. Maid of Honour Gaga looks absolutely gorgeous as she poses on the steps with the other bridesmaids, her bleach blonde tresses pinned up to the side with a flower. Picture: Twitter
19-year-old heartthrob Harry Styles can't stop smiling in his role as Best Man at his mum Anne's wedding. The One Direction singer looks all grown-up in his smart tuxedo and little corsage. Bless! Picture: Xposure
Pippa Middleton caused a world-wide storm when she arrived on the British social scene back in April 2011. The raven-haired beauty wowed as Maid of Honour in a simple white dress and floral headpiece, at her older sister Kate's wedding to Prince William at Westminster Abbey.
No-one knows you quite like a sibling. Prince William and his wife-to-be certainly agreed on that point. Just as Kate picked her sister Philippa to be her Maid of Honour, Prince William wanted his younger brother Harry right by his side for the most important day of his life. Harry opted for a traditional outfit for his brother's wedding and chose to wear his Blues and Royals Ceremonial Uniform. The Prince looks very dapper indeed in the deep blue uniform with gold brocade.
Pretty in purple: Vanessa White, Frankie Sandford and Rochelle Wiseman look gorgeous as they leave the church in the sunshine. The girls were bridesmaids for their band mate Una Healy's wedding to rugby player Ben Foden. Picture: WENN
Keira's Knightly dazzles in a knee-skimming purple dress at the wedding of her older brother Caleb, as he ties the knot with designer Kerry Nixon.
Jessica Alba and husband Cash Warren make a handsome pairing as they attend a friends wedding at Greystone Mansion in Beverly Hills, California. Cash was Best Man and Jessica was a bridesmaid. Picture: Goff