Action star Rosie Huntington Whiteley is looking lean and mean…hehe okay, not mean, just lean.

Hitting up the gym yesterday (5/15) in Beverly Hills, CA the “Transformer” actress rocked a Yankee baseball cap, a spaghetti strap tank, and capri pants.

My guess is she took a yoga or Pilates class since she’s not wearing any sneakers, nor is carrying any.

Photos by FameFlynet