Selena Gomez has celebrated another milestone birthday! The former Disney Channel star turned 29 on July 22, and rang in her big day with a pool party and barbecue attended by her close pals. The singer stunned in a multicolored, floral printed dress, before changing into a gorgeous, shimmering gold gown. Selena was all smiles as she posed in front of a balloon arrangement with her friends Zoe Brinneke, Theresa Marie Mingue, and Paige Reed.