Secret No More: Ryan & Rihanna Rendevous

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Rihanna‘s got a steamy new collaboration! Though one source told Us Weekly the singer, 23, appeared to blow off Ryan Phillippe, 36, at a Gucci/Roc Nation brunch in L.A. on Feb. 12, a second insider says it was actually just the opposite — and that the two had a sleepover that very night!

“She thinks he’s hot,” says the source. “They totally had sex. And it wasn’t even the first time!”

“They initially hooked up when things were strained with [Rihanna's ex] Matt Kemp back in early December,” says a Rihanna source. Phillippe (whose three-month, nonexclusive romance with Amanda Seyfried recently fizzled) and Rihanna then reconnected at Bing’s Two Kings charity event Feb. 19 — though again, they played it cool.

“There was no PDA,” says an attendee of the Los Angeles party. The next day, he went to her 23rd birthday party at a Beverly Hills home. Says an onlooker, “They hung out a bit, but were discreet. It is still very casual.” Sums up another source, “Clearly they’re keeping it on the downlow!”

Denise Richards Dating Nikki Six

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Denise Richards has a thing for rockers, and she’s not afraid to admit it!

The day after UsMagazine.com broke the news the actress, 39, was dating Motley Crue bassist Nikki Sixx, 56, Andy Cohen quizzed her about their romance on Bravo’s Watch What Happens L!ve Thursday night.

At first Richards, who split with Richie Sambora in 2007, attempted to play coy.

“What’s considered dating?” she asked. (Cohen’s response? “Sleeping together.”) But the mother of two — with ex Charlie Sheen — eventually admitted she and the rocker have “gone on a couple dates.”

Still she insisted she and Sixx, a former heroin addict who has been married to two Playboy models and most recently dated Kat Von D, aren’t in a rush to get serious.

“You want if anything’s gonna develop, you want it to develop on its own,” she said, while admitting she was sweating from the interrogation. “That’s the god’s honest truth, we’re taking it very slowly.”

Paris Says She’s Back with Stavros – For Now

Paris Hilton is back together with her ex-boyfriend, Greek shipping heir Stavros Niarchos – at least for now.

“We’re together now here. We love each other,” Hilton, who, like Niarchos, is in Saint-Tropez, told PEOPLE on Monday at Diddy’s Unforgettable 50 party aboard a rented yacht.

While talking to PEOPLE, Hilton paused for a moment to call Niarchos on her PDA. “Stav, where are you, baby?” she said. “Come on over. I love you.”

Seconded Hilton’s friend, Carolina D’Amore, “They love each other very much.”  

On Saturday night, Hilton was seen partying with Niarchos at the VIP Room nightclub, where she treated him to a pole dance. The following night they kissed at the nearby club Les Caves du Roy.

Hilton, 25, and Stavros, 21, split in May after seven months of dating.

Niarchos was previously involved with Mary-Kate Olsen. After his split from Hilton, he was spotted partying with Lindsay Lohan.

Hilton was previously engaged to Paris Latsis, also a Greek shipping heir.