Jennifer Aniston was having cocktails and smoking up a cloud storm at The Peninsula Chicago with a friend, where she stayed while filming The Break Up. . . . Either Jeremy Piven has a weak bladder or his recent Emmy nom for “Entourage” has already gone to his head: while at Rockit Bar & Grill recently he budged a friend of mine in line for the bathroom, saying only, “I’m next.” . . . I partied with the celebs who came to town for Challenge for the Children. Former members of ‘N Sync who started the benefit in 1999-Justin Timberlake, JC Chasez, Lance Bass, Joey Fatone, and Chris Kirkpatrick-along with actors Shannon Elizabeth, Beverly Mitchell, David Gallagher, Donald Faison, Taye Diggs, Shondrella Avery, and Alfonso Ribeiro and football players Roy Williams and Brian Urlacher, bowled at 10pin and b-balled at Allstate Arena. And some even boozed it up at Rockit and Le Passage, where I did shots with ‘N Sync’s Kirkpatrick.