Charlie Sheen; Brett Rossi Charlie Sheen; Brett Rossi

Charlie Sheen will walk down the aisle again.

The Anger Management star is engaged to his girlfriend, porn star Brett Rossi, E! Online reports. He proposed on Saturday during a Valentine's Day trip to Hawaii.

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"We are engaged! He even was a gentleman and got down on one knee," Rossi told E!. "I was not expecting it at all. We had a beautiful Valentine's Day, and he proposed to me early this morning after we watched the sun rise."

This will be the fourth marriage for Sheen, 48. His first marriage to Donna Peele was annulled in 1996, and his marriages to Denise Richards and Brooke Mueller ended in divorce.