Elvis Presley's granddaughter Riley Keough is to wed British actor Alex Pettyfer, according to reports.

The couple met on the set of new male stripper movie Magic Mike and has been dating for just six months, according to UsMagazine.com.

Model/actress Keough, who is Lisa Marie Presley's daughter, was spotted sporting what appeared to be an engagement ring while dining with Pettyfer in Los Angeles on Monday.

The 21-year-old Brit's ex-girlfriends include actresses Emma Roberts and Dianna Agron, while Keough, 22, enjoyed a long teenage romance with singer Ryan Cabrera.

Representatives for the stars had yet to respond to requests for a comment as WENN went to press.