Justin Timberlake, Ashley Olsen Hooking Up?

"SexyBack" meets Full House!

The new Us Weekly, out Wednesday, reports that Justin Timberlake and Ashley Olsen -- both newly single, former child stars with their own fashion labels -- have been inseparable (and flirty!) in and around NYC of late.

One insider close to the pair (spotted together at the Greenwich Hotel, an SNL afterparty, two Broadway shows and a polo match outside the city) tells Us: "They are hooking up."

Adds another source of the unexpected twosome, who both ended high-profile relationships in March (he with Jessica Biel after 4 years together, she with actor Justin Bartha after two years): "They're really trying to keep it on the down-low."

(A rep for Timberlake denies anything non-platonic, telling Us: "They are friends. They are not romantically involved.")

Still, an Olsen source says that the former sitcom kid turned fashion mogul is "aware of Justin's reputation with women, but...They're in the same head space."

Credit: Us Magazine

Olivia Wilde Puts Timberlake Rumors To Rest

Is a relationship between Justin Timberlake and Olivia Wilde heating up? Not according to the House, M.D. star.

"Cool it, honeybadgers," Wilde, 27, Tweeted Monday, apparently referring to reports that she and Timberlake were seen snuggling at an L.A. nightclub. "We are just friends and have been for years."

The two, who costar in the upcoming sci-fi movie Now, were spotted on Saturday at The Roxbury in Hollywood, where they were apparently getting cozy in a VIP section before moving to the patio so Timberlake, 30, could listen to hip-hop.

While some source say the newly single actress and Timberlake appeared to be a on a date, another source tells PEOPLE: "They've been friends since they worked together on Alpha Dog. Nothing's going on. They're just friends."

Credit: PEOPLE

Justin Timberlake, Olivia Wilde Dancing, Flirting

Double rebound!

Two of Hollywood's hottest newly single stars found sexy solace with one another at L.A. hotspot Roxbury over the weekend: Justin Timberlake and Olivia Wilde.

Each clad in white t-shirts and jeans, Timberlake, 30, and Wilde, 26, were "dancing all night" at the club, one insider tells Us Magazine. (Timberlake split from girlfriend Jessica Biel last month after over three years together, while Wilde filed for divorce from hubby Tao Ruspoli after eight years of marriage March 11.)

Although the duo (who are costars in the flick Now) took pains to avoid kissing in public, "they were obviously a couple or on a date," the insider says. "They were dancing, whispering, he had his hand on her back and shoulders and they were together all night."

Another witness adds that the twosome were joined by DJ (and Lindsay Lohan ex) Samantha Ronson and others. "His arm was around her, they were talking closely, just the two of them...Justin and Olivia were there with a group, but weren't talking to anyone else." (The pair began their night in the VIP section before moving on to the patio.)

A third source adds that the twosome "definitely looked like they were on a date."

Credit: Us Magazine

Newly Single Jessica Biel Flirts With Gerard Butler

Just five days after announcing her split with beau of four years Justin Timberlake, Jessica Biel was spotted cozying up to her Playing the Field costar Gerard Butler.

Currently filming the flick in Shreveport, Louisiana, Biel, 29, and the 300 hunk, 41, were first spotted out for a crew member's birthday at a Japanese restaurant on March 15.

"When Gerry got there, he made a beeline for Jessica," an eyewitness tells Us. "He was really flirting with her."

Two nights later, the duo was seen throwing back margaritas at a Mexican restaurant. And that's not all, Biel and Butler shared two more dinners later that week!

Still a source close to the actress says, "She only wants to be friends."

Credit: Us Magazine

Marriage Talk Didn't Break Up Justin & Jessica

Friends of Justin Timberlake and Jessica Biel have already shot down rumors that the couple's recent breakup was caused by cheating.

Nor was it caused by a discussion of marriage, friends of the two tell PEOPLE.

"The topic of marriage wasn't the catalyst or final straw that broke up the relationship," says a Timberlake friend, responding to rumors that Biel, 29, pressured Timberlake, 30, to rush down the aisle.

Contrary to some reports, "there was no ring shopping," says a source close to Biel. "She wasn't even thinking about marriage. That didn't play a part in their breakup at all."

In the wake of the split, Timberlake "is upset," says his friend. "They always spent vacations together. They always spent down time together. He was invested in her, in her friends and family."

Continues the friend: "He was invested in their relationship on a lot of different levels. After four years it's just not easy to walk away from it." 

Credit: PEOPLE (Michelle Tauber)

Mila Kunis: 'Nothing to Do' with JT/Jessica Split

Just days after Justin Timberlake and Jessica Biel announced their split, there is already speculation that the singer-actor's Friends with Benefits costar, Mila Kunis, was the cause of the break-up.

Not true, says a source close to Timberlake, 30.

"Mila had nothing to do with their break-up," the source says. "In fact, no one came between them. They decided their relationship ran its course and it was time to move on."

But now that he is a single man – and Biel, 29, is stepping out as a single woman – has Timberlake already moved on with Kunis, 28?

"They're not in a relationship," the source says. "They star in a movie called Friends with Benefits but they're just friends. That's it. They are not together."

Credit: PEOPLE

Jessica Biel Steps Out Post-Timberlake Split

Jessica Biel is once again a single girl – and she's ready to step out on the town.

The actress, who is no longer dating her boyfriend of more than three years, Justin Timberlake, appeared happy and content as she left Café Entourage in Los Angeles early Sunday morning, March 13, 2011.

Dressed in jeans, a leather jacket and donning a long feathery earring, Biel, 29, smiled for photographers outside Hollywood's sleek new all-night diner.

And why not show off her gorgeous smile? A source told PEOPLE of Biel's split with Timberlake, 30, "There are no hard feelings."

Adds another source, "There really wasn't a final straw. They're just two people who realized they wanted different things in life and were headed in different directions." 

Not sure if I'm buying that though, doesn't every Hollywood break-up end "mutually?"

Credit: PEOPLE

Justin & Jessica Biel 'Wanted Different Things'

Justin Timberlake and Jessica Biel's three-and-a-half year romance had simply run its course, a source tells PEOPLE.

"It really was mutual," the source says. "There really wasn't a final straw. They're just two people who realized they wanted different things in life and were headed in different directions."

Adds the source: "It was just easier to end it now rather than later."

As for any rumors of Timberlake's infidelity during their relationship, "There was never any proof," the source adds. "When you're in a relationship, you have to choose to believe the person or get out."

Last month, Timberlake, 30, and his Friends with Benefits costar Mila Kunis were "pretty inseparable" at an afterparty for the Screen Actors Guild Awards, but a source said at the time that the pair – who lit up the Oscars stage as co-presenters a couple of weeks later – were just friends.

In October, another source shot down chatter that Timberlake was cheating on Biel with actress Olivia Munn.

Despite the infidelity rumors, Timberlake and Biel continued to show a united front and spend quality time together.

A different source who knows the couple said Biel "looked the other way" when it came to Timberlake's alleged cheating. The source says "it's been a rough road" for the pair who denied rumors of a breakup in 2009 after spending some time apart due to busy work schedules.

Biel is said to be doing "fine" – and is expected to head to New Orleans next week to spend a few months shooting the new film Playing the Field with Gerard Butler and Uma Thurman.

"It's never easy when a relationship ends," the first source says, "but she knows this needed to happen and she's moving on with her life."

Credit: PEOPLE (Aili Nahas)

Justin Timberlake and Jessica Biel Break Up

Justin Timberlake and Jessica Biel are no longer a couple.

The two decided to end their relationship recently and "there are no hard feelings," a source tells PEOPLE exclusively. "It was completely mutual and they both decided it was time to move on."

The source adds that Biel is keeping her house in L.A. and she and Timberlake, who started dating in 2007, will remain friends.

Reps for the couple released a statement Thursday, confirming the split: "Addressing the media speculation regarding Jessica Biel and Justin Timberlake'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."

Timberlake, 30, and Biel, 29, were spotted together looking cozy as recently as the Vanity Fair post-Oscars party on Feb. 27.

Credit: PEOPLE (Julie Jordan)

Taylor Swift's Dream Prom Date: Katy Perry

When asked which celebrity she'd want to take to a prom, Taylor Swift names a few dream choices.

"It would be a group, and it would be a really fun group," the singer, 21, says on the Jan. 3 episode of the Rachael Ray show. "Because all these different reasons. Well, Katy Perry would be so much fun. She’s just like crazy fun and like spontaneous."

Swift continues, "Diddy has always been very nice to me. Justin Timberlake is the same way, he’s really funny. And, Sheryl Crow is really down to earth and really cool. And like, J. Lo would be a really good dancer!"

Noticeably absent from her list is one star she's been seen with recently: Jake Gyllenhaal.

Credit: Us Magazine