This week in the world of celebrity social media, stars were soaking up the last days of Summer and sharing their cute candids along the way. Models Miranda Kerr and Bar Refaeli enjoyed the great outdoors, and cool couple Nicole Richie and Joel Madden had a stylish night on the town. John Stamos celebrated his 50th birthday with none other than the woman responsible for his birth, while Lady Gaga got in bed with Karl Lagerfeld (kind of). Adam Levine may have been trying to channel his lingerie-model fiancée Behati Prinsloo in a sexy shirtless pic. There were also lots of on-set snaps to be had, as Ian Somerhalder gave us his signature stare while filming Vampire Diaries and Zooey Deschanel was literally blue in the face on the New Girl set — she shared a hilarious photo with the cryptic caption, "Weird job."