Pictures of Fergie's Las Vegas Birthday and The American Red Cross Youth Run With Josh Duhamel, Paris Hilton, Dianna Agron 2011-03-28 13:18:59

Fergie rang in her 36th year in Las Vegas with a bash at The Bank on Friday. She donned a sexy fringe Herve Leger dress to celebrate with Josh Duhamel, but was back to workout gear once the duo returned home to LA. The birthday girl and her husband got sporty for yesterday's American Red Cross Youth Run, which was hosted by Josh to benefit Japan relief. Plenty of stars joined over 4,000 participants in supporting the cause, including Glee's Dianna Agron, her I Am Number Four costar Teresa Palmer, and Paris and Nicky Hilton. Fergie and Josh's busy weekend didn't end there, though, since they hit the town with Kate Hudson later last night.