Usher Sex Tape for Sale  —  A sex tape featuring Usher and his ex-wife, Tameka Foster, is being hawked around town ... TMZ has learned.  —  TMZ was approached several days ago by someone claiming to have the sex tape.  The person sent us a short video and two photos.

Mila Kunis ‘Had Nothing to Do’ with Justin Timberlake & Jessica Biel's Split  —  Just days after Justin Timberlake and Jessica Biel announced their split, there is already speculation that the singer-actor's Friends with Benefits costar, Mila Kunis, was the cause of the break-up.

Charlie Sheen's Twins Celebrate Birthday - Without Their Dad  —  Charlie Sheen's “winning” ways didn't score him an invite to his sons' birthday party.  —  The troubled actor's boys, Max and Bob who turn 2 on Monday, celebrated at a party Sunday with their mom, Brooke Mueller, and about 50 guests.

Jake Gyllenhaal — Bathroom Run-in at SXSW  —  Jake Gyllenhaal was the victim of a serious Guy Code violation during a screening of his movie “Source Code” at SXSW — when a guy tried to take his picture ... in the bathroom!  —  We're told Jake was in the restroom, doing his thing, when a guy snapped off a pic.

PIC: See Kate Middleton's Sexy Bikini Bod  —  Kate Middleton is white hot!  —  In a series of never-before-seen photos taken while the princess-to-be vacationed with Prince William in Ibiza, Spain, in 2006, Middleton shows off her tanned and toned physique in a sexy white bikini.

Charlie Sheen Tour — Sold Out in 18 Minutes!  —  Charlie Sheen has won the Internet again — his upcoming mini-tour sold out in just 18 minutes ... and now he's planning on adding extra shows.  —  We're told the time is a Ticketmaster record and that Charlie will be adding additional tour stops some time in the near future.

Singer Darius shares his secret Valentine's wedding exclusively with ‘HELLO!’  —  Low-profile love: celebs who say ‘I do’ in secret  —  It was the most intimate celebrity wedding of the year, with the happy couple joined only by the bride's two sons.  —  And shortly after Darius Campbell …

Scott Disick: I'm No Longer ‘Selfish, Self-Centered’  —  Scott Disick says giving up alcohol hasn't just made him sober - it's also made him nicer.  —  “You know, I just realized there's bigger things in the world than just being a selfish, self-centered, pr-k,” Disick, 27 …

PHOTOS: Kim Kardashian Tweets From Eva Longoria's Flapper Birthday Party  —  Eva Longoria threw herself a lavish birthday party Saturday night, and her good friend Kim Kardashian shared the event with her Twitter followers.  You can see Kim's Twitpics here on RadarOnline.com.

Arrest Warrant Issued for ‘Kill Bill’ Star  —  Cops are on the hunt for “Kill Bill” star Michael Madsen ... who allegedly owes around $570,000 in child and spousal support debts ... TMZ has learned.  —  According to court documents, Madsen failed to show up for a hearing in his child/spousal support case …