Riley Keough, Great Elvis Presley's granddaughter, engaged with Alex Pettyfer

Elvis Presley's granddaughter Riley Keough is engaged with her boyfriend after about six months of dating and she is photographed with her engagement ring recentlya source confirms to Us Weekly.

Her boyfriend is Brit bad boy Alex Pettyfer, Keough’s boyfriend of six months whom she met on the set of the upcoming movie Magic Mike. Pettyfer, 21, was last linked to Glee’s Dianna Agron, his costar in I Am Number Four, and dated Julia Roberts’ niece Emma Roberts.

Lisa Marie Presley's daughter with ex husband, musician Danny Keough, model-actress daughter, 22, and the British actor, 21, were first photographed smooching last October. And on Monday, the twosome grabbed lunch at Le Petit Four in L.A. --with Keough sporting an engagement ring.

Pettyfer, who strips down alongside Channing Tatum, Joe Manganiello and Matthew Bomer in Steven Soderbergh's Magic Mike, has previouslydated actresses Emma Roberts and Dianna Agron. Keough's exe boyfriends include Ryan Cabrera and Jonah Hill.