* Leonardo Di Caprio is putting on his poker face.

The Hollywood Reporter says Leo is attached to star in a film about Costa Rica-based online casinos.

Paramount picked up an untitled pitch for the film from writers Brian Koppelman and David Levien, who wrote "Ocean's Thirteen" and "Rounders."

* The Hollywood Reporter says Natalie Portman will star in "Black Swan," from director Darren Aronofsky ("The Wrestler").

Portman will play a veteran ballerina who finds herself competing with a rival dancer.

Is this the second coming of "The Turning Point"? No, the script is a supernatural thriller.

A supernatural ballet thriller.

* The publisher of "Harry Potter" says it intends to fight a lawsuit alleging that author J.K. Rowling stole the idea for the books.

A statement from Bloomsbury Publishing says the suit alleges Rowling took the idea from author Adrian Jacobs. Jacobs has since died but his estate is suing.

Bloomsbury said yesterday that such a plagiarism allegation is "unfounded, unsubstantiated and untrue" and that Rowling had "never heard of Adrian Jacobs nor seen, read, or heard of his book."

Bloomsbury says Jacobs' book - "Willy the Wizard" - had limited distribution.

Rowling's books, on the other hand, had unlimited distribution.

* Elle magazine says London police are investigating allegations that jewelry was stolen after an Elle fashion shoot featuring Lindsay Lohan.

Police confirmed that a necklace and earrings worth about $411,000 were missing from a studio in north London in early June.

A police spokesman said no arrests have been made. Elle said in a statement yesterday it had no reason to believe that Lindsay was in any way linked to the alleged theft.

Lindsay, however, is hoping police will investigate who stole her career.

* The incredibly annoying Spencer and Heidi Pratt, deservedly mocked in a "Today" interview by hero weatherman Al Roker, have told Life & Style, that they would graciously return to "I'm a Celebrity . . . Get Me Out of Here" for "$1 million each an episode."

Roker really should have taken these two clowns over his knee.

After returning from the jungle, Spencer said the pair holed up at the Four Seasons Hotel.

"We took multiple baths and got manicures, pedicures and facials," Spencer said.