...or not, depending on how you look at it: Pint-sized British rapper Lady Sovereign showed up at The Underground (56 W. Illinois St.) Friday, but failed to follow through on her promised live performance. Reps for the subterranean hot spot told us she cited "personal reasons" and didn't elaborate. But from what we saw, it seemed like she had no personal problem with partying at Billy Dec's club, while the owner and pal Jeremy Piven sat at a nearby table.

Frankly, we're totally miffed, though not a bit surprised. Last month there was a big to-do over the Lady's onstage breakdown in Brooklyn-also a night when she was scheduled to perform following her opening act for the Gwen Stefani concert. News reports say she had a hissy and complained to the crowd about being broke and unable to pay rent.

Hey, Lady: Akon got behind the mic for a bit at Enclave on Friday after he also opened for Gwen. And Pete Wentz was able to DJ and dance at Enclave Saturday following his Fall Out Boy show. Get your act together before you piss off more people and lose fans that help you make money.

You could put George Clooney and Brad Pitt in a documentary about mold, and people would probably go see it. Fortunately, the two leading men were actually in the highly entertaining "Ocean's Thirteen," and the heist flick raked in $37.1 million this weekend to top the box office. This was well ahead of the still chugging-along "Pirates of the Caribbean: At World's End," which placed second in its third week with $21.3 million. "Knocked Up" held strong in its second week, placing third with $20 million, and the new, just-OK penguin movie "Surf's Up" took fourth with $18 million. The flop? That would be "Hostel: Part II," which made only $8.8 million to finish sixth for the week. That's more than $10 million less than the original gore-fest made in its first week in January 2006. Does this mean audiences are no longer interested in Eli Roth's twisted brand of overseas punishment? Were crowds just focused on the eye candy in "Ocean's Thirteen"? Or were fans--at least in Chicago--still swooning over the stars' appearance at the red carpet premiere? (Watch our video here.)