Undercover, Australia — An all-star cast including his wife Beyonce, John Mayer, Kanye West, Mary J. Blige, Rihanna and Diddy joined Jay-Z at his tribute to 911 show in New York this week. more info

MTV.com News — Beyoncé, Mary J. Blige, John Mayer, Pharrell, Kid Cudi and Santigold also join Hov onstage at Madison Square Garden.By Shaheem Reid Kanye West, Jay-Z and Rihanna perform in NYC Friday night Photo: Kevin Mazur/ Getty Images NEW YORK — Ja... more info

People.com — The musician says his 'Milli' has never slam-danced with her 'Vanilli' more info

Perez Hilton — John Mayer did as all good celebrities do and took to his Twitter last night to address the rumors that he's been hooking up with Kristin Cavallari for the past two years. Mayer tweets: "Rumor control: How do I put this like a gentleman…I have nev... more info

AngryApe — Are the former lovers romancing again? more info

Dlisted — You know that rumor about how John Mayer and Kristin Calafartmeorwhatever have been licking on each other's vaginas for two years? John Mayer has pissed all over it on his Twitter. Instead of just pulling a Kanye and saying "BITCH BOGUS," John b... more info

Starpulse — Jessica Simpson and John Mayer have reportedly rekindled their romance after failing to find love with others since their break-up.[...] Read more! more info

MTV.com News — Director Joseph Kahn says Em would stay in character on set, in Behind the Lens. By Gil Kaufman Eminem in "We Made You" Photo: Aftermath/ Interscope Eminem's clip for "We Made You" might seem like a laugh, but for the rapper, the tabloid-t... more info

Perez Hilton — Apparently, shacking up with her for TWO YEARS!!! Reports claim that John Mayer and Kristin Cavallari from The Hills have been hooking up secretly for quite some time (two years!). The pair have been sneaking off to a mutual friend's house in the Mt.... more info

Dlisted — Last week, Page Six printed this blind item: Which womanizing crooner has been dating a reality TV starlet for more than two years, putting her up in hotels wherever he travels for shows. According to Janet Charlton, the two twats hiding under that b... more info