John Mayer's little black book reads like a who's who of GQ magazine covers: There's Jennifer Love Hewitt, Jessica Simpson, Jennifer Aniston, Minka Kelly, Taylor Swift and, most recently, new divorcee Katy Perry.


But Perry's friends are worried about the singer due to Mayer's lady-killer reputation, according to Radar Online. Sources say her pals are urging her to end it with Mayer before she gets too attached. "Katy's friends and family haven't taken to John at all. In fact, they are worried that she is headed for heartbreak," a source says. "Despite the fiery image Katy likes to present, she's actually more fragile than that, and when John dumped her a few weeks after they first got together she was devastated. Now she ... has let her guard down, and there's only one way this can end -- in disaster."


Disaster -- or an eventual song about Mayer and his heartbreaking ways. Or, depending on how you feel about Katy Perry's singing, it could be both.

Kanye West proves his stamina


It looks like there could be some truth to the rumors of a Kanye West sex tape -- or two tapes, even -- now that lawyers for the rapper have sent out a cease-and-desist letter to multiple media outlets demanding they take down posts featuring a screen shot allegedly taken from the video, according to "Be advised that the screen shot, as well as the tape from which the screen shot was taken, were illegally obtained," West's attorney writes in the letter. "Both tapes are impressively long," sources tell the website. "The second is more than 40 [minutes]."


Forty minutes! What stamina! But here's my question: Do you think West made these sex tapes so he would have something in common with his new girlfriend, Kim Kardashian? Ah, the things we do for love.