0TwitpicsMario Lopez meets Mary Kay Letourneau, Lady Gaga hearts NY, and Justin Bieber finds a new hairdo to admire. See pictures of stars' Twitter photos.Updated Jul. 14, 2017 9:09PM EDT / Published Dec. 01, 2010 12:47PM EST David Arquette Katy Perry Ben Stiller Margaret Cho Mario Lopez Lady Gaga Judd Apatow Kylie Minogue Joel McHale Sarah Palin Marc Jacobs Eliza Dushku Justin Bieber
David Arquette Katy Perry Ben Stiller Margaret Cho Mario Lopez Lady Gaga Judd Apatow Kylie Minogue Joel McHale Sarah Palin Marc Jacobs Eliza Dushku Justin Bieber