Michaele and Tareq Salahi — the couple that allegedly crashed the White House — will enter the next season of “Celebrity Rehab” ... along with one of the greatest NY Mets players of all time ... TMZ has learned  —  Sources connected to the production tell us ... Dr. Drew will have one hell of a cast for Season 5 ... including:

Charlie Sheen: I Twitter for Cash!  —  Charlie Sheen told TMZ ... the reason he's taken up Twitter is simple — it's a “cash cow.”  —  Sheen told us ... his primary motivation behind the new ramblings is that he can score a fortune through advertising.  To give this some context …

BRITNEY FOREVER  —  Britney Spears, the sweetest girl who ever emerged from McComb, Mississippi, is once again on a mission to make us dance.  This spring, the greatest pop star of our generation returns with Femme Fatale, a suite of hits destined for good times, late nights, and heavy clubland rotation.

Scarlett Johansson & Sean Penn Take Whirlwind Trip to Mexico  —  It was a short getaway, but Sean Penn and Scarlett Johansson made the most of it.  —  The pair left on a private jet from Van Nuys airport Tuesday morning, then were spotted having dinner in Cabo San Lucas, Mexico, that night, according to sources.

Whitney & Bobby's Daughter Bobbi Kristina Caught Snorting Coke!  [PHOTOS]  —  Bobbi Kristina, daughter to Whitney Houston and Bobby Brown, has allegedly been photographed sniffing coke.  The pictures have been published in the March issue of the National Inquirer.

EXCLUSIVE: Kim Kardashian Vows To Keep New Relationship ‘Out Of The Spotlight’  —  When you are a mega-successful reality star and celebrity icon it's difficult to keep your love life private, but that's just what Kim Kardashian is vowing to do.  —  EXCLUSIVE PHOTOS: Kim Kardashian Rocks Some New Denim

‘Hunger Games’ search heats up with Lawrence  —  Jennifer Lawrence, Hailee Steinfeld, Abigail Breslin vie for lead … With the Oscars over, two of this year's up-and-coming nominees are being considered for the hottest female role available at the moment: the lead in “Hunger Games.”

Paula Abdul Dials 911 to Escape Boyfriend's Car  —  Paula Abdul made a frantic and tearful 911 call during a Valentine's Day drive with a boyfriend — repeatedly screaming, “Drop me off!” ...  and TMZ has obtained the recording.  —  During the call — placed at 4:35 PM on Valentine's Day …

Gotta Hand It To Zac  —  National Enquirer (March 14, 2011) claims Zac Efron has been spotted hand-holding with a dude at an NBA party at the W in L.A. on February 18: … The article claims that “Zanessa” are clearly not together, but are clearly still friendly.  —  Full article after the jump...

Jay-Z Worried About Rihanna's Deteriorating Health Due to Punishing Schedule  —  When Rihanna performed at the NBA All-Star Game last month, it was apparent her typically stellar vocals were a bit on the weak side, as the singer was reportedly suffering from a bout with bronchitis.

Exclusive: Dual Hobbit Film Titles Revealed?  —  Ringer Spy Mr. Underbelly monitors movie titles that are registered by major film studios.  Mr. Underbelly noticed that New Line has recently registered the following two film titles:  —  The Hobbit: There and Back Again  —  and...

Warner Bros Sets Diane Lane For Superman's Adopted Mother, Martha Kent  —  Warner Bros. Pictures and Legendary Pictures announced today that Oscar®-nominated actress Diane Lane will play Martha Kent, the only mother Clark Kent has ever known, in the new Superman movie to be directed by Zack Snyder.

Selena Gomez Didn't Get Punched By a Justin Bieber Fan, Says Rep  —  Selena Gomez has received online threats from fans who adore her boyfriend, Justin Bieber, but have haters taken things a step further?  —  Rumors started on Twitter Wednesday that Gomez, 18, had been punched by a fan …

Official: Christina Aguilera joins NBC's ‘The Voice’  —  Christina Aguilera is coming to NBC.  —  The five-time Grammy winner has signed on as a coach/judge on Mark Burnett's singing competition series The Voice.  —  Celebrity singers fill three spots on the judging panel so far, with Xtina joining Cee Lo Green and Adam Levine.

Jessica Simpson Is a ‘Frontrunner’ to Judge The X Factor  —  Although buzz about which celebrities could join Simon Cowell's new show The X Factor is already going strong, a new name has been added to the mix.  Jessica Simpson is a frontrunner to become one of the judges alongside Cowell, a show insider tells PEOPLE.

Ken Starr, accountant to the stars, sentenced to 7 1/2 years for $30 million Ponzi scheme  —  Crooked accountant Ken Starr, whose clients once included actress Uma Thurman and Oscar-winner Natalie Portman, was sentenced Wednesday to 71/2 years in prison for a $30 million Ponzi scam.

The Official Royal Wedding Web Site Is Launched  —  Start clicking: Prince William and fiancée Kate Middleton are set to reveal details of the bride-to-be's wedding dress on their newly launched Web site, which aims to celebrate all aspects of their upcoming nuptials.

Keith Richards' Fashion Model Daughter — ARRESTED  —  Keith Richards' 25-year-old daughter was arrested last night — after the famous fashion model allegedly defaced public property ... while in possession of marijuana and a controlled substance ... TMZ has learned.

‘Entourage’ creator sets HBO pilot with Ed Burns  —  Ed Burns to star in ensembler about guys in their 40s … First he tackled guys in their 20s living the fantasy life in Hollywood.  Now “Entourage” creator Doug Ellin is ready to grow up a bit with a new HBO pilot to star Ed Burns …