Famous Friends (and Naomi Campbell) Fete Mandela

Nelson Mandela’s 90th birthday bash isn’t until Friday, but celebs are already flocking to London to fete the former South African president.

Will Smith (who’s emceeing Friday’s event) and Jada Pinkett Smith were just two boldfaced names in attendance at a prebirthday dinner party held in Hyde Park. Also on the list: Oprah Winfrey, Uma Thurman, Forest Whitaker, Kim Cattrall and Denzel Washington.

And yes, Naomi Campbell will be in the house on Friday.

Despite reports that the birthday boy had banned the supermodel from introducing some of the performers after her airport arrest, her rep says that was never the plan.

“To my knowledge, she has always just been a guest,” he told E! News.

One trainwreck who is allowed on stage at the soiree? Amy Winehouse. The troubled singer is slated to sing, as well as Leona Lewis, Queen and Annie Lennox.

It will be Amy’s first performance since her hospitalization last week.

Pete Wentz Adopts a Baby … Puppy!

Pete Wentz and Ashlee Simpson-Wentz have a new addition to their family: a 10-week-old puppy.

“The newest addition to the family. Meet Rigby,” writes Wentz about their new pet.

Wentz is known for his love of pets: His dog Hemingway was the ringbearer for his May wedding to Ashlee, who showed off her baby bump at Wentz’s bar opening last week.

And luckily, Rigby loves Hemingway just as much. “[She] pretty much follows Hem around,” says Wentz.

But for his 29th birthday on June 5, he also commissioned a cake that was a life-size replica of Hemingway.

“Kinda weird to eat your dog,” writes Wentz. “But I got past it.”

Ben Kingsley: Mary-Kate Was ‘In Charge’ of Make-Out Scene

He’s a screen legend – heck, he’s even been knighted! But Sir Ben Kingsley isn’t above a little kiss-and-tell when it comes to his on-screen smooch with 22-year-old Mary-Kate Olsen in The Wackness.

“She was completely in charge,” the actor, 64, tells people of their enthusiastic make-out scene in a telephone booth.

The former star of Gandhi and Schindler’s List – who’s currently shooting with Martin Scorcese in Boston – drove down to New York for the movie’s Cinema Society and Sony Cierge-sponsored party at the Gramercy Roof Club.

“I love watching the movie,” his wife, Daniela, said of the coming-of-age stoner film. As for her real-life leading man, she added, “I love him. He’s amazing.”

Writer/director Jonathan Levine said that although he was never a drug dealer, the film is loosely based on his own experiences growing up in New York. And even with this all-star cast, Levine still passed along a few valuable lessons.

Most notably? “I did have to teach Sir Ben how to take a bong hit.”