‘American Pie’ Star Busted for DUI  —  TMZ has learned Chris Klein — who played Oz in “American Pie” — was arrested early this morning on suspicion of DUI.  —  Law enforcement sources tell us a CHP officer stopped Klein on the 101 freeway in Los Angeles at 3:13AM.

EXCLUSIVE: Megan Fox Is Engaged Again!  —  Megan Fox is engaged again, reports the new Us Weekly (on newsstands now).  —  On-again beau Brian Austin Green popped the question to Fox, 24, June 1.  —  But in all the excitement, the happy couple somehow lost the ring, sources tell Us Weekly.

Brooke Mueller Headed Back to Rehab  —  Sources tell TMZ Brooke Mueller has fallen off the wagon again and she is telling people she's checking into a rehab facility for 30 days.  —  Sources say Brooke has been receiving ongoing treatment for substance abuse at her home …

Exclusive: Al Gore Cheats with Larry David's Ex  —  Al Gore's split from wife Tipper after 40 years of marriage was a shock to everyone who thought theirs was the ideal marriage.  Now Star can exclusively reveal that the former Vice President was having an affair with Larry David's ex-wife — for the past two years!

EXCLUSIVE: Source: Levi Johnston, Bristol Palin Are Back On!  —  Despite all the drama, baby Tripp Johnston's estranged parents are making it work after all.  —  Although Bristol Palin and Levi Johnston broke off their engagement in March 2009, an insider tells UsMagazine.com that relations …

Miley Cyrus upskirt shot: Child porn?  —  Blogger Perez Hilton posts a link to an alleged upskirt photo of the 17-year-old — and could face serious charges  —  Perez Hilton has built a thriving career out of offensive behavior: He's called countless female celebrities bitches, hos …

‘Jersey Shore’ — Half the Cast on Chopping Block  —  The oil-soaked handwriting is on the wall ... TMZ has learned “Jersey Shore” is about to lose 4 familiar, overly-tanned faces in Season 3 ... to make room for 4 fresh overly-tanned faces.  —  Our spies tell us ... the footage …

Tori Spelling: Why I Got So Skinny  —  Tori Spelling's wafer-thin frame has been the topic of much debate — and in her new book, TerriTORI, she reveals why she shed so much weight.  —  According to USA Today, Spelling, 37, blames swine flu, stomach pain, migraines and nerve problems for her weight loss.

Cameron Diaz Comes Clean About Alex Rodriguez  —  In the July issue of Playboy, Cameron Diaz opens up about the men in her life.  —  First on the list: Alex Rodriguez, with whom she enjoyed romantic dinners and whose NYC apartment she was once spotted leaving one morning in May.

HBO Greenlights ‘Hemingway & Gellhorn’ Starring Clive Owen And Nicole Kidman  —  EXCLUSIVE: It took James Gandolfini 6 years to get the story of Ernest Hemingway and Martha Gellhorn to the screen.  Now HBO has just given the green light to Hemingway & Gellhorn, an original movie produced by Gandolfini …

Nicolas Cage To Return As ‘Ghost Rider’  —  Nicolas Cage is revving up for a Ghost Rider sequel - the actor has signed to star in a follow-up.  —  Rumors of a sequel have been rife in recent months, and now movie bosses have persuaded Cage to ride back into action as demon vigilante Johnny Blaze, according to producer Mike De Luca.

Sony Pics High-Kicking ‘Karate Kid’ Sequel  —  After The Karate Kid's opening weekend gross of $56 million blew past its $40 million budget, a sequel to the Jaden Smith-Jackie Chan-starrer seemed inevitable.  Sure enough, agency sources tell me that Sony's Columbia Pictures execs are meeting …

Robert Pattinson dumps Kristen Stewart  —  Robert Pattinson has had enough of Kristen Stewart's negative attitude and finally called it quits, Life & Style has learned.  —  In fact, Life & Style can reveal that Rob broke things off with Kristen earlier this year.

Gabourey Sidibe's Mother Impresses on 'America's Got Talent'  —  Oscar-nominated actress Gabourey Sidibe isn't the only talent in the family.  —  Her mother, Alice Tan Ridley, is a well-known subway performer with a huge, booming singing voice.  And Ridley used her vocal chords to wow the judges on 'America's Got Talent.'

Elton John ‘a Little Surprised’ at Rush Limbaugh Wedding Invite  —  Add Elton John to those who were not expecting him to get an invite to Rush Limbaugh's wedding.  —  “To put it in Elton's exact words, when he got the invitation, he was ‘a little surprised,’ ” his partner David Furnish told PEOPLE …

Tiffani Thiessen Welcomes a Baby Girl  —  Tiffani Thiessen and husband Brady Smith have a reason to celebrate!  —  The couple welcomed their first child, daughter Harper Renn Smith, on Tuesday in Los Angeles, her rep tells PEOPLE exclusively.  —  Baby Harper, who weighed in at 8 lbs., 3 oz., is “doing great,” as are the new parents.

Watch: Angelina Jolie Releases a Special Video in Honor of World Refugee Day  —  Publicizing the plight of refugees worldwide is a cause close to Angelina Jolie's heart, and in honor of World Refugee Day on June 20th she's speaking out on the issue.  She teamed up with the UNHCR to bring attention to the holiday with a brand-new video.

Police Cancel Hanson, Drake Concert in NYC Over Crowd Concerns  —  A free concert by pop band Hanson and up-and-coming Canadian rapper Drake was canceled Tuesday after twice as many people as anticipated showed up and many became unruly, police said.  —  The show started at about 6 PM …