Alex Pettyfer, 21, and Riley Keough, 22, got engaged! Riley is Elvis' granddaughter who also happens to be a model and actress. Riley and the controversial British actor have been dating for all of six months.

Alex's new movie is Magic Mike, in which he plays a stripper. Riley and her fiance met on the set of the movie. They were first photographed kissing in October.

Grabbing some lunch in Los Angeles on Monday, Riley was spotted wearing an engagement ring. A source confirmed that she's about to get wifed up.