The 42 year old, who starred in former U.S. crime drama series Crossing Jordan, got down on one knee when his actress lover recently visited the set of his new Disney show I'm in the Band - proposing in front of a live studio audience.
Valentine admits it was a nerve-wracking experience but he was relieved when Korobkina, 27, accepted.
He says, "I was very emotional all day. Everyone cheered. Everyone was crying. It was a very lovely moment."