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Trouble in paradise for LiLo and Sam!

The Sun reports that the young couple was partying at London nightclub Boujis when who else showed up? Lindsay's ex Calum Best! And, in a risque move, Linds started dancing with Calum and Samantha saw...

And that's when, so says an onlooker:

"Sam came screeching up to Lindsay, screaming bloody murder and throwing punches. She went ballistic. The pair traded a series of blows before Calum managed to pry them apart. It was a really ugly scene."

Afterward, Lindsay was "furious" with her girlfriend. So, in the lobby of the club - another eyewitness reveals - LiLo "launched herself at Sam... spitting at her and clawing at her chest."

OUCH!

Could this be the end of the happy couple or do ya think the story has been slightly exaggerated?

We caught Calum Best getting hot 'n heavy on a yacht with a decidedly familiar-looking young lady. We certainly can't fault Calum for having a type, but it might be time for him to think about moving on!

Summer is here and, with this heat wave in full swing, new couples are forming everywhere! First there's Hilary Duff and Frankie Delgado above......and what about Haylie Duff and Brody Jenner?! (Easy there, Brody.) They're allegedly (everything is "alleged," right?) dating as well, not to mention Jessica Simpson and Dane Cook below.Don't try to hide it guys! And then there's Calum Best and Kimberly Stewart.But what about Lindsay? Who's Ms. Lohan going to be with?

Look inside to see!

This story just keeps getting more and more intriguing! First he's with Lindsay Lohan at her 21st birthday party earlier this week, then he's spotted with Kimberly Stewart - not once, but twice! (Seriously, Kimberly Stewart? Can we get a "who cares," please? What a step down from Lindsay!) And now, Calum has been spotted with yet another blonde hottie on the beach in Malibu. The guy really gets around! Or is he just a hanger on who wants to be famous? He's certainly not going to make any friends by cheating on Lindsay and Kimberly!

Sure looks that way - we spotted the pair hurrying out of Il Sole last night!

Then again, with Calum having flown in just to show up to Lindsay's 21st (and with Lindsay apparently claiming she now has a boyfriend), and Kimberly said to be dating rocker Tommy Lee, maybe they're "just friends". And maybe that's what Lindsay will say when Calum asks her about these shots of her flirting with A.J. Lamas!

Kimberly Stewart was moving in on Lindsay's man! Well, maybe not, after all, with Tommy Lee at home, how could you have eyes for anyone else?

Also, Big Love's diabolical (or is she just a victim?) Daveigh Chase, Brody Jenner, football great Joe Montana, Frances Fisher, Cheryl Tiegs, Dancing With The Stars runner-up John O'Hurley, haunt the obligatory Hollywood hotspots, Il Sole and Teddy's.

Really, Lindsay? This guy looks like a 13-year-old girl's 5-minute infatuation while she's going through her "I like bad boys" phase during middle school. Was he really worth all the fuss, all your tears? Model (Again, really? - he's basically bald!) Calum Best showed up at Linds' 21st b-day party in Malibu the other day. He better have gotten her something nice! And a pack of cigarettes doesn't count.

...Calum Best was copping an attitude whenever the subject of Lindsay Lohan came up! Geez, Calum, it's not like the details of you and Lindsay's relationship was top-secret material back when you two were "on" - why play coy now?

Speaking of playing coy, we also caught Avril Lavigne at Koi (well, sorta)! We also spotted Ian Ziering at Hyde, the Gastineau girls out and about, and Wilmer Valderrama and David Weintraub completing the bad-boy trifecta at Joseph's. But the weirdest collection of stars we saw last night had to be the triple threat of Mike Tyson, Barry Manilow, and Inside The Actor's Studio host James Lipton at Mr. Chow's! Wonder if they shared a table?