Jessica Biel & Justin Timberlake SPLIT!

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Cry him a river!

After four years together, on-again/off-again couple Justin Timberlake, 30, and Jessica Biel, 29, have broken up.

In a joint statement, reps for the couple confirm to Usmagazine.com, “Addressing the media speculation regarding Jessica Biel and Justin Timberlakeā€™s relationship, we are confirming that they mutually have decided to part ways. The two remain friends and continue to hold the highest level of love and respect for each other.”

“It was mutual,” says an insider. “Jessica is doing well.”

The pair began dating in January 2007 and were often the subject of splitĀ rumors.

Last year, Biel told Vogue of her relationship, “It’s the most precious thing that I have in my life, and I care so much about it that I don’t care about what anyone else says or thinks.”

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!”

Pete Wentz Couldn’t Trust Ashlee Simpson

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When the going gets tough, the tough go partying — at least Ashlee Simpson does.

Although their Feb. 9 divorce announcement took many by surprise, pals close to Simpson and husband Pete Wentz tell the new Us Weekly that the spouses of nearly three years “have been talking about splitting up forever.”

Simpson, 26, had coped in part with the impending split by having some late, late-night fun. “Ashlee has been out late partying for the past few months,” says one insider. Specifically, the singer-actress — and mom to son Bronx, 2 — hangs with a crew of pro skateboarders in San Clemente, Calif., and returns home at sunrise.

“She would lose track of time,” the insider says.

Fall Out Boy rocker Wentz, 31, “started getting burnt out” by those antics, another source says. On the road with his band, he “would constantly check in on Ashlee, and he’d have his friends call the house and her cell to make sure she said she was where she said she was going to be,” an insider explains. “He felt like he couldn’t trust her.”

Jessica Alba: Baby #2 on the Way!

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The actress announced on her Facebook page and Twitter account Wednesday that she and her husband are expecting their second child.

“I thought I’d drop by to let you all in on some exciting news — Honor is going to be a Big Sister!” Alba, 29, wrote.

“Cash and I are thrilled and wanted to share the news directly with you so you didn’t hear about it somewhere else.”

“I appreciated all of the love and support you all gave me during my first pregnancy and will definitely appreciate it again this time around. Have a great day!” she finishes, signing off, “Jess.”

Warren also posted to his Twitter page, “@jessicaalba are beyond excited about the news! Honor is going to be a great big sister. Thank you all for the wonderful messages!!”

Alba delivered daughter Honor Marie, 2, in June 2008, a month after marrying Warren in California.