Skin is in this week!
Lady Gaga shows off her bare backside while soaking up the sun on vacation, Colton Haynes flaunts his chiseled chest in a shirtless selfie and "Victoria's Secret" stunner Nina Agdal hilariously splits her pants at the gym.
Elsewhere, Zac Efron takes in the sights while on location for his new movie in Hawaii, Paris Hilton shows off her hot bod while partying in Ibiza and James Franco looks like one hot mama wearing a long brunette wig and a vintage corset.
Plus, Adam Levine tries to get through his plane's turbulence with some meditation, Andy Cohen sticks out his tongue with Miley Cyrus at amfAR's Inspiration Gala and Selena Gomez shows off her sleek new 'do!
Click "Launch Gallery" above to see these stars' personal pics and even more celeb selfies in this week's best celebrity TwitPics!
