Robert Pattinson Is Not Dating Riley Keough

07/02/2013 at 01:35 PM EDT

Robert Pattinson Is Not Dating Riley Keough
Robert Pattinson and Riley Keough
Jason Merritt/Getty; Luis Guerra/Ramey
Does Robert Pattinson have a new leading lady?

The Twilight actor, 27, was spotted driving around Los Angeles by X17 Online this weekend with a redhead identified by the site as Riley Keough, the daughter of Lisa Marie Presley and granddaughter of Elvis Presley.

However, "that is not Riley Keough in the photo with Robert Pattinson," her rep tells PEOPLE. "They are not dating.”

Thus, the identity of the woman in the car remains a mystery.

Keough, 24, and Pattinson are indeed friends – and she is also pals with his old flame Kristen Stewart.

She acted with Stewart in the 2010 film The Runaways and attended her 23rd birthday party in April, along with Pattinson and a host of other friends, at the Malo restaurant in Silver Lake, Calif.

"Riley spent the weekend in LA with girlfriends, including Kristen,” a source tells PEOPLE.

Keough previously dated English actor Alex Pettyfer, a.k.a. Adam from Magic Mike – to whom she reportedly was briefly engaged – as well as singer Ryan Cabrera.

Pattinson and Stewart split this spring after dating on and off for three years. They even initially survived Stewart's cheating scandal last summer with her married Snow White and the Huntsman director Rupert Sanders.

A source recently told PEOPLE that Pattinson is "definitely over her" and now happily single.

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