In fact, Pete hosted the soiree at Jet nightclub totally solo, while Ash stayed behind in New York City. Not only was she babysitting Bronx, but she's also performing in Chicago on Broadway.
"The two had an intimate moment, kissing in front of the entire crowd, where patrons screamed and cheered for the happy couple," a source tells E!. Looks like they're over the rough patch they hit in 2009.
Also smooching in Sin City was...
And although Kellan Lutz and Annalynne McCord hosted separate South Beach parties, a source confirms to E! that the two met up at the Shore Club as soon as their hosting duties were done.
They must have had a sleepover, since the twosome were spotted lounging at the hotel pool the next morning.
Not afraid of a little PDA was crooner Common, who locked lips with girlfriend Serena Williams after performing at The Florida Room at the Delano.
Back in LA, Hills hotties Lauren Conrad, Lo Bosworth and Stephanie Pratt hit Beso, for a party hosted by E!'s own Jason Kennedy. Guests at Gridlock's NYE party at Paramount Studios got a extra peep show when Pam Anderson took the stage with Adam Lambert.
Somehow, Pam's dress ended up coming down and her whole boob was hanging out on stage. Naturally, she seemed nonplussed.
And in the Big Apple, power couple Mariah Carey and Nick Cannon were everywhere. First, she performed in Times Square. Then, the two hosted JoonBug.com's party at M2, before stopping into Cafeteria for a late-night private party starting at 5 a.m.
And if that isn't enough NYE 411 FYI, check out stars resolutions from Lindsay Lohan and other celebs.