Hot couple alert: Zac Efron and Lily Collins?

Feb 8, 2012 at 10:08 a.m. ET

Heartthrob Zac Efron has set off reports that he is dating actress Lily Collins after the pair was spotted sneaking out of a Los Angeles restaurant together.

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It seems Lily Collins has nabbed herself another Hollywood heartthrob following her split from Abduction co-star Taylor Lautner. We hear the Mirror Mirror actress, 22, is cozying up to Zac!

Zac and Lily were caught trying to sneak out the backdoor of the STK Steakhouse in Los Angeles on Saturday night.

"Zac literally ran to the car and jumped in, leaving Lily behind," a nosy paparazzo told X17 Online this week. "But Lily kept her cool and took her time. She wasn't as worried about not being seen by us. She probably didn't want to trip in her heels!"

The couple was at the eatery for a birthday dinner for one of Zac's pals, a snoop squealed to People magazine. Insiders tell the glossy that the actor's romance with Lily is the real deal.

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"They even walked in holding hands… They had a drink at the bar together and then joined the birthday crew on the patio," the spywitness said.

Remember the good old days when Zac, 24, was practically married to his High School Musical co-star Vanessa Hudgens? Sigh, simpler times.

These days, we can't keep track of who he's dating. In the past three months, the actor has been linked to fellow singletons Rumer Willis, Emma Roberts and Taylor Swift. And let's not forget about the cougars: Desperate Housewives' Eva Longoria and Rumer's mom, actress Demi Moore.

Lily is next set to star alongside British actor Jamie Campbell Bower in the action movie The Mortal Instruments. Meanwhile, Zac is going where he's never gone before on film… the bedroom!

The Disney graduate completes his move from teen idol to "serious dramatic actor" with a sex scene in the film version of Nicholas Sparks' bestselling novel The Lucky One. It's the story of a marine (Efron) who returns home from the Iraq War, who tracks down a woman (Taylor Schilling) whose photo he found and used as a lucky charm during duty.

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