See what Hollywood's biggest celebrities were up to this week. See what Hollywood's biggest celebrities were up to this week. - John Mayer and Katy Perry celebrated the release of her new single, Roar, at Manhattan restaurant, The Lion, on Monday night.

British actor Orlando Bloom is the top candidate to land the part of Batman in the upcoming film Man of Steel 2, according to the Daily Express.

Parks and Recreation stars Amy Poehler and Aubrey Plaza decided to put on quite a show for the paparazzi.While on break between filming scenes for their hit NBC show, the comedians decided to make out for the cameras. They're clearly faking it, but they definitely know how to have some fun.

Jennifer Lawrence appears on VOGUE's annual best-seller for September's Fall Fashion Issue.