Usher Sex Tape for Sale  —  A sex tape featuring Usher and his ex-wife, Tameka Foster, is being hocked 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.

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.

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.

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.

Ashlee Simpson, Pete Wentz Have Back-to-Back Fast Food Reunions  —  Maybe this marriage can be saved . . . by burgers and burritos?  Despite their divorce filing last month, Ashlee Simpson and Pete Wentz didn't keep their distance this past weekend.  —  Simpson, 26, and Wentz, 31 …

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.

Lindsay Lohan — Another Vice Bites the Dust  —  Lindsay Lohan has quit smoking — a great move for her health ... whether there's a jail sentence for probation violation on her horizon ... or not (as she continues to believe).  —  Sources close to Lindsay tell TMZ she's continuing on the path …

THE MANY DEATHS OF CHARLIE  —  CHARLIE SHEEN Sheen has suffered at least FOUR potentially fatal drug overdoses in the last six months - and he's alive today only because of the quick action of friends and staffers at his Beverly Hills mansion.  —  The drug-addled Two and a Half Men star …

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 …

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.