Us Weekly: Did Beckham Cheat on Posh?

Is soccer stud David Beckham cheating on his wife? Join us for a daily peek into the Hot Stuff column in the latest Us Weekly magazine.

Coming Monday: Brad Pitt wows Kerry's kids.

Did Beckham Cheat on Posh?:

Britain is abuzz over an alleged affair between Real Madrid soccer stud David Beckham, 28 — married to Victoria "Posh Spice" Beckham, 30 — and his ex-assistant, Rebecca Loos, 26.

A friend of Loos, who has retreated to a hotel outside Madrid, tells Hot Stuff, "Rebecca knew he had a history of cheating. More women are going to come forward."

Loos was fired last fall after her shopping pal Posh suspected something was going on. Brittany's Big Birthday Surprise: Brittany Murphy bowled over her fiancé, Jeff Kwatinetz, on April 3. The actress, 26, threw Kwatinetz (he's the founder of the Firm, one of Hollywood's leading management companies) a surprise 39th-birthday party at Pinz Bowling Center in Studio City, California.

"His mouth dropped open, and he was like, 'Oh, wow,' '' one partygoer tells Hot Stuff.

Murphy decorated Pinz with black and silver balloons, mini footballs and silver stars hanging from the ceiling emblazoned with the logo of Kwatinetz's favorite football team, the Oakland Raiders.

The cake featured Kwatinetz as a superhero. It read, "Happy Birthday Kwatman! We Love You!" Guests, including Jared Leto, Snoop Dogg and Ice Cube, partied till almost 3 a.m.

Meanwhile, another source tells Hot Stuff that Murphy recently recorded a duet with legendary singer-songwriter Carly Simon for the soundtrack of Murphy's upcoming movie Little Black Book.

The new tune will be released as a single. And, yes, we're told Murphy wants to branch out into music and record her own album. Wednesday's Glimpse at Hot Stuff

Is Clooney's Ex After Ben?: Just call her "k. lo." Hot Stuff has learned that Krista Allen, 32, who broke off her nearly two-year relationship with George Clooney in March, has recently been spending quality time with two of Jennifer Lopez's former flames.

Allen, who first met Ben Affleck at a celebrity poker tournament in L.A. in February, ran into the actor on March 21 at the Bellagio casino in Las Vegas, where they "really hit it off," according to a source close to Allen.

"They hung out and had a lot of fun. He really likes her sense of humor and energy. Krista is a total goofball."

The source insists the two haven't hooked up — yet. "Krista has a total crush on him," says the source. Allen and Affleck met up again nine days later on March 30 at a fundraiser for John Kerry supporters (more details on that in the new Us).

"They were standing very close, definitely crossing that line into 'intimate space,' " an onlooker reports.

"They seemed very at ease with each other."

However, Allen, dressed in a low-cut pink summer dress, didn't leave with Affleck — it was another Lopez ex, Cris Judd, who drove her home.

"She and Cris are just friends," says her pal. "She and Ben are somewhere in between." Neither Allen nor Affleck's rep would comment.

Britney's Doggie Drama: Britney Spears, 22, has a serious case of puppy love. A source tells Hot Stuff that her hottie "Toxic" video costar Matthew Felker, 24, visited the pop princess on the Los Angeles set of her new video, "Everytime," with a four-month-old toy poodle/Shih Tzu mutt named Chloe.

The source says Spears was so taken with the canine that she asked to buy the pooch.

Sadly, Chloe wasn't his to sell: Felker was just dogsitting for a friend. Rather than deal with a tearful farewell, Felker sneaked into Spears's trailer while she was out, grabbed the pooch and made a quick getaway.

Felker didn't bother telling her that Chloe used to belong to her rumored onetime paramour Fred Durst.

Come back to on Monday for another glimpse into Hot Stuff from the latest Us Weekly.