Jennifer Aniston & John Mayer: Broken Up?  —  Jennifer Aniston and John Mayer may have called it quits.  —  That's the rumor I'm hearing.  A source says that the pair's on-again, off-again relationship may have ended when Aniston returned from overseas, where she was promoting Marley & Me.

Madonna Makes Surprise Appearance at Britney's NYC Show  —  Madonna made a surprise appearance at Britney Spears' sold-out show Circus show Wednesday in New York City.  —  Shortly before Spears, 27, took the stage at the Nassau Coliseum on Long Island, Madonna, 50, arrived with her manager Guy Oseary …

Official ‘If U Seek Amy’ Music Video  — “i knew it!  what an amazing show” —suzy  — “Hurrahy!! tha u r safe in NYC, can't wait that you come to chicago... ill” —D17th  — “Nice” —Neo  — “hi................” —hardeep  — “Madonna walked right by me!!!

BROWN READY TO CLEAN HOUSE  —  CHRIS Brown is said to be through with his manager, whose sexy text-messages supposedly sparked the fight that ended with his alleged beating of Rihanna.  —  Brown is “looking for a whole new team” to replace his current crew, “starting with his manager, Tina Davis,” said our source.

Joaquin Pulled from Brawl — Pulling Our Leg Too?  —  Joaquin Phoenix jumped off the stage and attacked a fan at a Miami show last night — but, like anything with him these days, the whole thing could be one big set up.  —  It all went down at LIV nightclub at the Fontainebleau …

David Hasselhoff's Ex Arrested for Felony DUI  —  David Hasselhoff's ex-wife could have used a little help from KITT from Knight Rider on Wednesday evening.  The actor's ex, Pamela Bach, was arrested for felony DUI in Los Angeles, police records show.  —  Bach, 46, was arrested at 9 p.m …

ScarJo & Mickey Rourke Help Raise Iron Curtain  —  Los Angeles (E! Online) - Scarlett Johansson is joining the superhero set.  —  Her rep confirms that the actress has signed on to play Black Widow in the Iron Man sequel opposite Robert Downey Jr. The deal was signed this afternoon.

Third ‘Twilight’ film finds director  —  Juan Antonio Bayona will helm ‘Eclipse’  —  Summit Entertainment has tapped Spanish director Juan Antonio Bayona to direct “Eclipse,” the third pic in the “Twilight” vampire series.  —  Summit, which had no comment Wednesday, is expected to make the official announcement soon.

Bristol Palin & Fiancé Split  —  Levi Johnston and Bristol Palin  —  Bristol Palin and her fiancé Levi Johnston have broken up, two sources tell PEOPLE.  —  The split happened “a few weeks ago,” according to a source close to the couple, but it's unclear what precipitated it.

Musical ‘Heathers’ headed to stage  —  ‘Witch Mountain’ helmer Andy Fickman developing prod'n  —  Get ready for “Heathers: The Musical.”  —  The influential 1988 teen dark comedy, which launched the careers of Winona Ryder, Christian Slater and scribe Dan Waters, is stagebound in a production …

Jonas Brothers Add Tween Apparel To Brand  —  Loyal fans of wildly popular musical pop trio the Jonas Brothers can already listen to their three top-selling albums; read their recently released book, “Burning Up,” and even see them in 3-D at the movie theater in “Jonas Brothers: The 3D Concert Experience.”

Shannen Doherty Reveals She'll Be Back on 90210  —  Women of 90210, you best hold on to your men!  —  Shannen Doherty herself just spilled to us that her man-stealing character Brenda Walsh will be coming back to America's most famous zip code for the first-season finale of the CW's 90210.

Rep: Anne Heche Welcomes a Son!  —  Anne Heche and beau James Tupper welcomed their first child together over the weekend, her rep confirms to Usmagazine.com.  —  Atlas Heche Tupper weighed in at six pounds, 12 ounces, the rep adds.  —  Heche finalized her divorce from ex Coley Laffoon …

Tim Gunn's Sexy Secret Crush!  —  Project Runway host Tim Gunn is daring to design a dream date on the not-so down low.  —  He's after his celeb crush and fellow silver fox Anderson Cooper, although the newsman, who stays silent on his sexuality, has been elusive.

Ask Ausiello: Spoilers on ‘Housewives,’ 'Grey's Anatomy,' ‘House,’ ‘Chuck,’ ‘Heroes,’ ‘NCIS,’ ‘Prison Break,’ ‘24,’ ‘Gossip Girl,’ ‘SVU,’ and more!  —  Question: Got any clues as to what's ailing Izzie on Grey's Anatomy?  —George  —  Ausiello: Sources confirm to me exclusively that Izzie …