Jessica Biel and Justin Timberlake arrive at Metropolitan Museum of Art's Costume Institute Gala, New York, on May 5, 2009. (AP)

Are Justin and Jessica together? Did they break up? Is he dating Rihanna?

FOX411 has the answers to all three of these burning questions.

Justin Timberlake, Jessica Biel and Rihanna have been at the center of a tabloid triangle for a week, with reports of a split, photographs of JTand Biel still together, and no confirmation from their reps either way.

PHOTOS: Click for pics of the lovely and talented Jessica Biel.

But sources tell FOX411 that the nearly three-year relationship between Timberlake and Biel is kaput. The couple has indeed parted ways, and Justin has moved onto a rebound romance with Rihanna.

"Justin and Jessica did break up. They were very busy living separate lives this summer and they drifted apart," says the insider. "Justin broke up with Jessica weeks ago, but he's a good guy and he does care about her. They will always stay in touch because he works very hard at friendships with his exes."

Indeed, Timberlake and ex Cameron Diaz even did red carpet events together in conjunction with the "Shrek" movies after those two split. But will Biel be able to keep her upper lip stiff like Diaz did?

"Jessica is obviously sad, and Justin is still around to be there for her," says the source. "Photos will still surface of them together because they will remain friends, and anytime she needs him, he will be there."

At least if he's not with Rihanna.

The same insider tells FOX411 that Justin is getting much closer to fellow pop superstar Rihanna. The two have always been friendly and enjoy working together, but now things are getting steamy.

PHOTOS: Click for pics of the lovely and talented Rihanna.

"Justin and Rihanna have been working frequently in the studio and they have amazing chemistry with or without the music," the snitch says. "Over VMA weekend, they spent quality time together and got a little naughty at Jay-Z's club, 40/40. Justin and Rihanna were having fun and there was a lapdance involved. They are way beyond co-workers."

Will Justin and Rihanna be the next super couple? Probably not, says the source. "Justin is a private guy and it would be difficult for him to date Rihanna under so much scrutiny. He likes to keep his life to himself, but they have unbelievable chemistry."