"Smash" actress Katharine McPhee may be used to being in the spotlight, but she was careful not to outshine her older sister, Adriana, who recently got married in Los Angeles.
The 28-year-old actress and singer acted as maid of honor at her sister's wedding, donning a pale pink bridesmaid gown and a simple updo for the occasion. The Daily Mail recently released photos of the happy bridesmaid and the glowing bride.
McPhee made it clear that she was excited for her sister to the knot, tweeting: "Hope everyone had a gr8 long weekend! I am off to LA tomorrow for many things. One being my Sisters wedding!!"
McPhee has been married to producer Nick Cokas since 2008.
But she's not the first celebrity to be part of a wedding party -- in fact, several other famous faces have played a part at their loved ones' nuptials.
Click through the slideshow to see which stars became a part of their non-famous friends' and families' wedding parties.
Starlet Selena Gomez made her way down the aisle in December 2011, but not as a bride. Gomez <a href="http://www.huffingtonpost.com/2011/12/09/justin-bieber-selena-gomez-beach-wedding-mexico-engaged-photos_n_1138692.html" target="_hplink">performed bridesmaid duties</a> at her friend <a href="http://wonderwall.msn.com/music/gossip-justin-and-selena-get-handsy-at-wedding-1657065.story" target="_hplink">Shannon Larossi's wedding</a> in Cabo San Lucas, Mexico, and brought her singing sensation boyfriend, Justin Bieber, with her too.
In <a href="http://stylenews.peoplestylewatch.com/2008/09/22/rachel-bilson-maid-of-honor-and-bridesmaid-dress-designer/" target="_hplink">September 2008</a>, actress Rachel Bilson was the maid of honor at her best friend's wedding in Santa Barbara, Calif. In addition to supporting the bride, the noted fashion icon <a href="http://stylenews.peoplestylewatch.com/2008/09/22/rachel-bilson-maid-of-honor-and-bridesmaid-dress-designer/" target="_hplink">teamed up with</a> designer Brian Reyes to create four one-of-a-kind silk georgette and chiffon gowns for the bridesmaids.
In January 2011, Britney Spears acted as <a href="http://www.tmz.com/2011/01/30/britney-spears-maid-of-honor-wedding-miami-photo/#.TufV93NW6fY" target="_hplink">maid of honor</a> for her assistant and friend Brett Miller in his Miami wedding. Spears wore a <a href="http://www.dailymail.co.uk/tvshowbiz/article-1352061/Britney-Spears-walks-aisle-time--time-maid-honour-friends-wedding.html" target="_hplink">floor-length blue gown</a> for the ceremony.
Jessica Simpson may have been very pregnant, but that didn't stop her from donning heels and a pink bridesmaid dress at the wedding of friend and former assistant Lauren Zelman, who<a href="http://www.usmagazine.com/celebrity-news/news/pregnant-jessica-simpson-wears-pink-bridesmaids-dress-at-wedding-2012263" target="_hplink"> tied the knot in Palm Springs, Calif.</a> in March.
In February 2009, former Pussycat Dolls lead singer and X-Factor judge Nicole Scherzinger stepped out of the spotlight to let her sister, Keala Leemon, shine on her wedding day. The maid-of-honor even provided her <a href="http://www.people.com/people/article/0,,20262743,00.html" target="_hplink">musical talents for the night</a>, performing during her sister's first dance.
In March 2008, actress Kate Bosworth <a href="http://www.popsugar.com/Kate-Bosworth-Plays-Beautiful-Bridesmaid-1103946" target="_hplink">played the role</a> of bridesmaid at her friend's wedding in Sydney. Bosworth wore a simple black gown.
Jessica Alba And Cash Warren
Married celeb couple Jessica Alba and Cash Warren both played a part in their pals' Amir Khastoo and Jacqui Lang's <a href="http://www.justjared.com/2010/09/18/jessica-alba-cash-warren-bridesmaid-best-man-in-beverly-hills/" target="_hplink">nuptials in September 2010</a>. Alba was a bridesmaid and Cash acted as Best Man for the groom.