Rolling Stone — “I gotta say, I’m really excited about Katy Perry,” Sheryl Crow gushed briefly about Perry’s Bumbershoot-opening set last night, slyly insinuating the chorus from “I Kissed a Girl” into her own opening number, “A Change Will Do You Good... more info

Perez Hilton — Rihanna's been playing the field lately - and we love it! We're sure she does too! Her latest boytoy is Mary-Kate Olsen's ex, Travis London. Travis and Princess RiRi have been seen all over El Lay, including having a romantic meal at Giorgio Baldi in... more info

Guardian Music — Rebecca surfs the musical Twittersphere so you don't have to – featuring P Diddy, Preston and Solange KnowlesThis morning, Radio 4's John Humphrys called Twitter "too daft to try", as he tried it, with a tweet. It took 140 characters for him t... more info

MTV.com News — Fefe Dobson, Phoenix also set to perform at MTV parties, beginning Thursday, September 10.By MTV News staff Cobra Starship's Gabe Saporta Photo: Daniel Boczarski/ Getty Images The 2009 MTV Video Music Awards will air live from New York's i... more info

MTV.com News — Cast -- including Robert Pattinson, Kristen Stewart, Taylor Lautner -- to appear on show.By Eric Ditzian Robert Pattinson, Kristen Stewart, and Taylor Lautner Photo: Kevin Winter/ Getty Images You probably thought we were done with the blo... more info

MTV.com News — Katy Perry will reportedly split fourth-seat duties with the pop-punk singer.By Gil Kaufman Avril Lavigne Photo: Joey Foley/ FilmMagic "American Idol" producers definitely appear to be sending a strong message to hopefuls who are vying to ... more info

VH1 News — Avril Lavigne will reportedly split "American Idol" guest-judging duties with Katy Perry at season nine's Los Angeles callbacks. more info

Chorus.fm — Check out an entire *Katy Perry* (http://soundsofbuzz.com/coca-cola/katyperry/) show on video here (http://soundsofbuzz.com/coca-cola/katyperry/). A trailer can be seen in the replies. more info

Mariah and Eminem have a war of words, and so do Katy Perry and Lady Gaga. But are these celebrity battles real or just a ploy for publicity? more info

AngryApe — But she looks the Idol star's honesty more info