Just weeks after Star first broke the news that Sean Penn was caught making out with Natalie Portman at L.A.ís Sunset Tower Hotel, the Oscar winner filed for separation from his wife of 13 years, Robin Wright Penn. Now Star has learned that Sean, 48, and Natalie are still seeing each other!

ìShe stimulates him in ways no other person has, mentally or professionally,î says a source. ìThereís a lot more there with Natalie than any of the other girls Seanís been with.î

It was Seanís mid-March indiscretion with Natalie that encouraged Robin, 43, to stop turning a blind eye to her husbandís philandering. ìShe was furious he was messing around with such a young star,î says an insider. ìIt made her sickly jealous.î

And with that, she told Sean sheíd had enough and expected him to be a faithful husband and father. ìShe told him how it was going to be,î says the source. ìBut Sean did it his way and filed. He can be a real jerk like that. This will not be a smooth divorce.î

[During] Deanís acceptance speech for his Best Actor win for Milk, he failed to mention his long-suffering wife, who sat just a few feet away, crying. It was in the weeks that followed the award ceremony that Sean first met up with Natalie. Will Sean be faithful to Natalie? Not likely, says the source. ìHeíll still hook up with girls. Itís what Sean always does.î

When we think of Natalie Portman, we picture her studying Sanskrit or giving immunizations to third world children; we don't usually think wanton maneater with a taste for Spicolis. That's Lohan's job.

The 'Changeling' star reportedly flew into a rage with partner Brad Pitt – with whom she raises six children – after learning the 'Closer' actress had personally asked for him to play her older lover in a new movie.

A source said: "Angelina had a massive fit and was shouting her head off. She accused Brad of flirting with Natalie. Angelina can't help but feel threatened. Brad knows how jealous she gets but won't stop saying how gorgeous and intelligent Natalie is. He keeps saying she is 'cute as a button.' "

Angelina and Brad have been dogged by rumours their relationship is in trouble in recent weeks. It was recently reported Brad had pleaded with his girlfriend to attend couples' counselling in a desperate bid to save their relationship.

Angelina is said to have agreed, but only after seeking the advice of her ex-husband Billy Bob Thornton.

A source said: "This just caused more friction with Brad because although he doesn't have a problem with her talking to her exes, he doesn't understand why she would take Billy Bob's advice to try therapy as when he suggested it to her she reacted very angrily."

Doy. Billy Bob is the master of persuasive banter. That slick, silver-tongued devil.

Sean Penn continues to live up to his reputation as a womanizer.

In the April 6 issue of Star, on sale today, we report that the married actor ó who had his wife Robin Wright Penn on his arm at the Academy Awards ó was seen in a passionate embrace with Natalie Portman.

Following dinner at Sunset Tower Hotel's Tower Bar on March 17 ó during which they were "constantly touching each other" ó Sean, 48, and Natalie, 27, hooked up. (They previously served together on the jury at the Cannes Film Festival in 2008.)

"They went to a bank of elevators that only goes to the spa or to private rooms," an eyewitness tells Star. "They came back about 45 minutes later, and that's when I saw them making out."

"There's a door outside of the hotel's Tower Bar that has a bridge to the terrace, so it's semi-private," the eyewitness explains. "I used that path to get to the restroom, and when I came back, I had to go through some curtains ó and that's when I interrupted Sean and Natalie! When they saw me, they were startled and quickly composed themselves."

Whatever. They weren't making out. They were reading to each other from one of Neitszhe's original manuscripts (bought at auction at Sothby's and encased in protective plastic sheeting) and then talked about their "technique". (Acting, not screwing.)

P.S. We're sick of Sean Penn supposedly hooking up with all of these starlets. Just once we want to read about Robin Wright Penn spending a night on the town carousing with hot young dudes, making out with Robert Pattinson in a banquette. She deserves it.

SOME roles just don't suit Natalie Portman. At the junket for the film version of his "Doubt," playwright John Patrick Shanley was asked how Amy Adams won the role of an emotionally conflicted nun. "I'm trying to think of what the etiquette is on this," Shanley chuckled, blushing a bit. Urged on by a blogger for gossipsauce.com, he continued, "Well, we asked Natalie Portman, and Natalie was very interested but kept saying she had a problem. And we finally nailed down as to what the problem was. She basically said she didn't understand celibacy."

We were totally on board with Natalie's sentiments at first. We mean, geesh, nunsówhat a bunch of prudes. But then we stumbled upon this photo and it was all clear. Nuns don't need orgasms to have a good time, they've got the ocean! Wheeee!

She's no prude; see Natalie Portman nude at MrSkin.com.

ï Right now, Brad and Angelina's adopted kids are looking around their filthy French chateau and thinking, "Screw this, man, there were fewer flies back in Ethiopia, man." (CelebWarship)

ï Kirk Cameron will NOT kiss any woman other than his wife onscreen; WILL star in a sitcom in which his best friend is called "Boner". (Holy Taco)

ï Susan Sarandon enjoyed beating the shit out of daughter Eva Amurri. For a movie! For a movie! (Daily Stab)

ï Dear Kim Kardashian: God would not have dealt you that colossal can and made you mambo on Dancing with the Stars if He didn't want you to shake it like a bottle of salad dressing. Wake up, Kim! Look alive! (F-listed)

ï The Girls Next Door: the truth comes out. You mean three large-breasted blondes in their twenties AREN'T banging an octogenarian? (Pop on the Pop)

ï Leighton Meester admits she was born in the slammer. (The Hollywood Gossip)

ï Top 5 Network TV Nude Scenes! (Mr. Skin)

ï It was mystical, magical water, and not a penis, that got Nicole Kidman pregnant. (The Blemish)

Nat gets naked! Check her out at MrSkin.com.

A U.S. magazine has been forced to apologize to actress Natalie Portman after suggesting she's far from happy with her performance in short film Hotel Chevalier. Sunday supplement Parade stated Portman was talking about the movie, in which she appears nude, when she commented about an "uncomfortable" scene she shot in a forthcoming essay she wrote for the publication. But the actress' publicist, Kelly Bush, has pounced on Parade, insisting her client was actually talking about a torture scene in new film Goya's Ghosts. A statement from the magazine's publicist reads, "We say that Portman regrets doing a nude scene in the movie Hotel Chevalier. This is wrong. When Portman writes about this in Parade, she does not mention a specific movie title. She tells us she was referring to a torture scene with a body double in Goya's Ghosts, which was taken out of context and leaked onto the Internet. Portman is very happy with Hotel Chevalier and proud of her work in the film."

Well, that's what you get when you deal with that libelous rag of lies, Parade. What a false tabloid! We hear that they totally fabricated their "10 Things You Don't Know About Connie Selecca" story. And that expose on "Inside Valerie Harper's Country Cottage"? Complete horseshit, man.

Thanks to Chans for the tip!

See the Nat nudes in question MrSkin.com.