The two celebrate JC Chasez's birthday. Plus: Brad & George, Mischa Barton, Lindsay Lohan and more

BOY IN THE BAND

Lance Bass stops by ex-bandmate JC Chasez's 30th birthday party in West Hollywood on Sunday. Bass, who attended with boyfriend Reichen Lemkuh (inset), also caught up with former 'N Sync-ers Justin Timberlake (who arrived with Cameron Diaz) and Chris Kirkpatrick at the bash.