The New York Post reports *NSYNC star Justin Timberlake attended the Britney Spears birthday party at Suite 16 on Friday. A spy revealed, “Britney was there first with a couple of girlfriends. When Justin walked in with two guys, they sat at a separate table. But he went over and kissed Britney and talked for a bit.” Then on Sunday, Timberlake partied with his mother Lynn Harless, where a spy saw someone at the table roll two joints and pass them around. Both Timberlake and his mom took a puff.