Carey Mulligan and Marcus Mumford: Engaged!

Childhood pen pals in London, actress Carey Mulligan and singer Marcus Mumford lost touch long ago. They recently reunited. They soon will be married.

After five months together, the Mumford & Sons singer, 24, popped the question to the Never Let Me Go star, 26. "They're a great couple," a pal says.

Things got serious when Mulligan and pal Jake Gyllenhaal caught a secret Mumford & Sons show in Nashville, Tenn. The rest, as they say, is history.

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The couple has dated for five months. Oscar-nominated Mulligan split with longtime beau and Transformers: Dark of the Moon star Shia LaBeouf last October.

Mumford broke up with singer Laura Marling in late 2010.

Congratulations to the happy couple!

[Photos: WENN.com]