"Anger Management" star Charlie Sheen has proposed to his girlfriend, adult-film actress Brett Rossi.

"Yes! We are engaged!" Rossi, 24, told E! News Sunday. "He even was a gentleman and got down on one knee. 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."

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She added, "The ring is classic and beautiful, but I don't have any photos to share just yet. This is the happiest moment of both our lives. He's my best friend and my soul mate."

Sheen, 48, tweeted Sunday that, "In a moment of Kray-zee gratitude, I got my gal!! 4evurr!." He also attached a picture of his nearly 5-year-old twin sons, Bob and Max, the youngest of his five children, captioned, "But I also have this!"

This will be Sheen's fourth marriage, or, as he told People magazine Sunday, technically only his third. "With all due respect to Donna" Peele, his first wife, whom he wed in 1995, "that was annulled. Therefore . . . 'three' truly is a charm." Sheen was married from 2002 to 2006 to actress Denise Richards, with whom he has daughters Sam, 9, and Lola, 8. In May 2008, he married Brooke Mueller, but filed for divorce about 2 years later.

Sheen became a grandfather in July 2013 when the eldest of his five children, Cassandra Jade Estevez, gave birth to a daughter, Luna. Sheen was 19 when Estevez was born to his high school sweetheart, Paula Speert, also known as Paula Profit. He walked his daughter down the aisle in 2010 when Estevez married Casey Huffman in Santa Barbara, E! said in 2011.