Zac Efron and Lily Collins dating?

Zac Efron and Lily Collins were reportedly out on a date over the weekend.

The 24-year-old heartthrob and the 22-year-old British actress were caught sneaking out the back door of Los Angeles steakhouse STK on Saturday night.

Zac appeared surprised by the hoard of photographers surrounding him when he exited the restaurant as Lily followed behind.

The pair, who shared the same chauffeured SUV, had opposite reactions to the unrequested attention.

“Zac literally ran to the car and jumped in, leaving Lily behind,” an eyewitness told X17 Online. “But Lily kept her cool and took her time. She wasn’t as worried about not being seen by us. She took her time. She probably didn’t want to trip in her heels!”

Zac is famed for his high-profile relationship with High School Musical co-star Vanessa Hudgens, which ended in winter 2010.

Lily was recently linked to Twilight star Taylor Lautner.