Celebrity Shirtless and Bikini Pictures

Break out your bikini and celebrate the first day of Summer! We're gearing up for the temperatures to rise with a look back at last year's hottest bikini and shirtless stars. Some of our favorite celebrities revealed their enviable bodies with swimsuit-filled vacations, family trips to the beach, and sexy photo shoots, including Gwen Stefani, Rachel Bilson, Courteney Cox, and more. Check out our roundup as you kick off your own Summer celebrations this week — surf's up!