Us Weekly: Did Beckham Cheat on Posh?

April 9 -- 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