Uh-oh!

Kristen Stewart's boyfriend, actor Michael Angarano was seen chatting, drinking, and leaving with an unknown brunette at a bar in Studio City, Californa, last night.

They both took off in his car and were last seen entering an apartment block in Sherman Oaks at around 1 a.m.

Looks like K-Stew may have a cheater on her hands.

We hope not.

This guy is the only thing standing in the way of K-Stew getting her claws into R-Patz! No!!!

Update: Sources are reporting to PerezHilton.com that K-Stew and Angarano quietly broke up about a month ago. That explains it all. Unfortunately, this now means she's free to date R-Patz.

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Spotted: Jon Gosselin and Homewrecking Hailey Glassman holding hands and hugging while strolling through Harriman State Park in New York state on Monday.

Not surprisingly, the douche was wearing an Ed Hardy T-shirt, while he pushed his toddler girlfriend on a swing.

Somewhere in Pennsylvania, eight little voices are asking why he isn't doing that for them.

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Spotted at the Ray LaMontagne concert the Hollywood Bowl on Sunday night: Justin Timberlake and Jessica Biel, Jeremy Sisto, Ron Livingston, Rachel Leigh Cook and Evangeline Lily.

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Spotted: Mourning the loss of his wife, Natasha Richardson, actor Liam Neeson was spotted taking a walk in Central Park on Friday afternoon, on his way to the American Irish Society.

Hopefully he's finding solace in friends during these difficult times!

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Thanks to our Perezcious readers, we've learned that Brad Pitt was just spotted at an office building at 2020 K Street in D.C. on Wednesday afternoon.

It seems he was there to meet with some attorneys.

The handsome daddy was then seen exiting through the back entrance where he was whisked away in a black SUV.

Wonder what type of attorneys he was meeting with and why? There was probably some charity angle involved!

Either way, it seems the kids were with Angelina and the nannies as Brad was without his large clan.

[Image via WENN.]

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Spotted: Shia LaDouche at Henry's Pub in San Diego on Thursday night, and being very rude to fans - several Perezcious Readers tell us.

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Spotted: Luke Wilson and older brother Andre having dinner at Guero's Mexican Restaurant in Austin on Monday night.

Are they there to spy on Lance & Kate????

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Spotted: Chace Crawford and on/off girlfriend Carrie Underwood at the Marquee 4 year anniversary party in NYC on Thursday night.

Spotted: Mary-Kate & Ashley Olsen catching up with Full House pals John Stamos and Bob Saget at the bar of the Bowery hotel on Wednesday night.

Spotted: Perez Hilton and Marc Jacobs having dinner at Mr. Chow's on 57th Street on Thursday night. Ha ha ha. We spotted ourselves!

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Spotted: Former N'Sync-er and Dancing With the Stars alum Joey Fatone watching the finale of Dancing With the Stars at Justin Timberlake's New York City bar, Southern Hospitality, on Tuesday night. He was "really into it," a source tells us.

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