Happy 33rd birthday to actor Adrian Grenier. He's made quite a name for himself as mega-star Vincent Chase on HBO's popular series Entourage, and Grenier returns for the show's sixth season, which starts this Sunday. Singer Jessica Simpson is 29. The former pop star tried her hand at country but she left her label, Sony Nashville, earlier this year. Fortunately, she still has her boyfriend, Dallas Cowboys quarterback Tony Romo. Rascal Flatts frontman Gary Levox turns 39 — you can catch him and his group now on tour with Darius Rucker. British actor Chiwetel Ejiofor, who's 35 today, has a couple of big movies coming up: the disaster flick 2012 with John Cusack later this year, and next year's spy movie Salt with Angelina Jolie. Legendary folk singer Arlo Guthrie is 62, and ace banjo picker Bela Fleck turns 51.

Photo by Claudette Barius