Matthew McConaughey and Camilla Alves

Mathew McConaughey gave his girlfriend Camila Alves a Christmas surprise when he popped the question.

"Just asked Camila to marry me, #MerryChristmas," he tweeted along with this photo of the happy couple.

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McConaughey, 42, and Alves, 29, have been dating since 2006 and are parents to 3-year-old son Levi and 23-month-old daughter Vida.