11/17/2008 at 01:00 AM EST
Parker may have gained 10 lbs. by spending her summer "cooking and eating," as she told PEOPLE, but after actress pal Lake Bell gave her the weight- loss book Skinny Bitch
, she added more veggies to her diet (although she didn't, as the book advises, go vegan).
Combined with a new trainer, Aimet Victoria—who has her doing strength and cardio workouts three to four times a week—Longoria "is looking absolutely fantastic," says a friend.