Weezer @ Hammerstein Ballroom, NYC 10/31/09

Despite the mixed response Rivers is getting in coming off like the long lost Jonas Bro of late, last week’s performances of “If You’re Wondering If I Want You To (I Want You To)” and “I’m Your Daddy” (in Weezer Snuggies) on Letterman were an irrefutable reminder that, while their fun-compass seems to lose its bearing in the studio, that very same ham-standing makes for some fun times live. With that in mind, photographer Kyle Dean Reinford hit Hammerstein Ballroom on Halloween night for what was sure to be a special Weezer event: Matt & Kim opened (dressed as Andy Warhol and Edie Sedgwick) before the =w= set, during which the guys had crowd members strip them of their insect costumes (repurposed from the Yo Gabba Gabba! taping) to the tune of “Undone (The Sweater Song).” Rumblings of a secret guest netted not a Weezy, but a Gossip Girl: Leighton Meester joined the band for “If You’re Wondering”; at this point, collaborating with a The CW star is very much par for the course plotted out by that wonky fun-compass. Besides, Leighton’s got a “pop song” so it’s not like they’ve totally lost the plot. I think! Here’s video of that:

In addition, P4K reports that Rivers is collaborating on a song with Adam Lambert, which better come out before 2012 because Lambert probably won’t live that long.