When it comes to planning your Wedding, one of the most important things is having your closest, most trustworthy friends by your side - and it's no different for celebrities. Over the years, many stars have attended each other's ceremonies, but a select few have included their high-profile pals in the official wedding party, whether they were bridesmaids, best men, or even officiants. In 2013, Chris Kirkpatrick had his former *NSYNC bandmates by his side for his nuptials, and the following year, Lauren Conrad married William Tell in front of a big group of bridesmaids that included her close friend and former reality show costar Lo Bosworth. Jessica Simpson has been in plenty of wedding parties, and Cameron Diaz has been a bridesmaid for two of her famous friends. Keep reading to see all the stars who have supported their famous friends on their big day, and check out all the celebrity weddings pictures you can handle.