Mumford & Sons frontman Marcus Mumford and actress Carey Mulligan have become engaged after a whirlwind five-month courtship. Though the two only recently began a romantic relationship, Mulligan and Mumford were actually pen pals as children in London and fell in love after getting back in touch for the first time in years. "They're a great couple," a friend told Us Weekly. "Very sweet."

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The couple first got serious when Mulligan and her friend Jake Gyllenhaal caught a secret Mumford & Sons gig in Nashville on February 7th. "At the end of the night there were just the musicians, Jake, Carey and the Mumford boys," an insider told Us. "We had some pizza and just played music. Jake picked up a guitar and Carey joined in on "Amazing Grace." Marcus and Carey seemed really friendly." A few days later, Mulligan and Mumford caught a secret Arcade Fire show in New York before hitting a private club.

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