Alex Pettyfer Engaged To Riley Keough: REPORT

03/13/2012 05:05 pm ET

Alex Pettyfer and Riley Keough aren't wasting any time.

Us Weekly reports that the 21-year-old British actor is engaged to Lisa Marie Presley's 22-year-old daughter after dating for only six months.

The couple were spotted on Monday getting lunch in Los Angeles and no one could ignore the giant rock Keough was sporting on her ring finger.

The couple met on the set of the upcoming male stripper movie, "Magic Mike," and were first seen kissing in October.

Pettyfer dated "Glee" star Dianna Agron for almost a year and broke things off in February 2011. The actor earned somewhat of a reputation as a loose cannon when it was reported that Agron was "terrified" of Pettyfer after he threatened her during a phone call. Reps for the actor denied that any threats were made.

Keough has also reportedly dated singer Ryan Cabrera and Jonah Hill.

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