See what the top celebrities have been up to. We are currently featuring Heidi Montag, Lindsay Lohan, John Mayer, Salma Hayek, Simon Cowell, Nicole Richie, Angelina Jolie, Rihana, Hilary Duff, Gwen Stefani, Brad Pitt, Anne Hathaway, Demi Lovato, Ellen Degeneres, Christina Aguilera, Beyonce Knowles, Miley Cyrus, Justin Timberlake, Channing Tatum, Mary Kate Olsen, Jessica Biel, Kim Kardashian, Leighton Meester, Hugh Jackman and Ashley Tisdale.