Source: Mischa Barton Placed Under Involuntary Psychiatric Hold  —  Mischa Barton was placed under an involuntary psychiatric hold (also known as a 5150) by the Los Angeles Police Department and transferred to Cedars-Sinai Medical Center on Wednesday evening, a source close to the situation claimed to Access Hollywood.

Inside Brad and Angelina's Birthday Party for the Twins!  —  Brad Pitt with Knox (left) and Angelina Jolie with Vivienne  —  They've already been to France, Japan and New York City.  So how did Brad Pitt and Angelina Jolie's globetrotting twins Knox and Vivienne celebrate their first birthday on July 12?

Caught in the Act!  —  • Tom Cruise, doing the famous “Single Ladies (Put a Ring on It)” dance at Beyoncé's concert at L.A.'s Staples Center.  “Everyone was laughing and taking pictures,” a concertgoer tells us of the scene.  When the actor originally arrived - sans wife Katie Holmes …

This week's cover: ‘Iron Man 2’ with exclusive photos!  —  Entertainment Weekly's second annual Comic-Con preview issue features Iron Man 2 on the cover, and inside it's packed with exclusive first looks at highly anticipated TV shows, comic books, and movies.

Ivanka Trump Is Engaged  —  Ivanka Trump got engaged to her longtime beau Jared Kushner last night, a rep for the couple confirms to Usmagazine.com.  —  “I'm very happy about it,” Donald Trump tells Usmagazine.com.  “They make a magnificent couple.”  —  Ivanka, 27, posted the news on Twitter earlier today.

Jon and Kate Gosselin Reunite at $1.1 Million Home  —  Jon and Kate Gosselin reunited Thursday afternoon for the first time since he took new girlfriend Hailey Glassman on a luxe getaway to France.  —  See photos from Jon and Hailey's trip.  —  The exes were spotted hanging out in the driveway …

Madonna's Stage Collapses, One Dead  —  The stage for Madonna's concert in Marseille, France collapsed today, killing one person and injuring six.  —  The collapse occurred at the Velodrome stadium where Madonna was going to perform on July 19, according to Reuters.  —  French papers say the concert has been canceled.

Exclusive: Pepsi responds to Michael Jackson accident footage.  ‘Why would anyone want to share such frightening images?’  —  Pepsi has responded to yesterday's appearance on the internet of footage of Michael Jackson being burned while filming an ad for the soft drink in 1984.

Jewelry Heist at Orlando Bloom's Place  —  Burglars apparently knew what we didn't — Orlando Bloom had hundreds of thousands of dollars worth of jewelry in his Hollywood Hills home.  Notice the past tense, because we've learned burglars made off with the bling last night.

Fact or Fiction: Are Gerard Butler and Jennifer Aniston More Than Friends?  —  Gerard Butler and Jennifer Aniston on set in New York  —  The Bounty Hunter costars Jennifer Aniston and Gerard Butler are making headlines with speculation over their off-screen romance - but a usually humorous Butler sets …

Jessica Simpson Is ‘Sad, Mad and Confused’  —  While Tony Romo is reveling in his renewed membership to the Singles-R-Us Club, Jessica Simpson is having a hard time coming to grips with being dumped a day before her 29th birthday.  —  “Jessica was really blindsided,” says a Simpson family friend.

‘Harry Potter’ nabs $58.4 million  —  WB pic casts spell over box office  —  Warner Bros.' “Harry Potter and the Half-Blood Prince” grossed a magical $58.4 million from 4,275 theaters as it opened Wednesday at the domestic B.O., including a potent $22.2 million in midnight shows.

Michael Jackson's Unreleased Song  —  We've just obtained the track for an unreleased song Michael Jackson recorded.  —  The song — “A Place with No Name” — sounds similar to the song “A Horse with No Name” released by the group America back in 1971.  We're told several years ago America's manager gave …