Slater, 44, announced their engagement in February. In an interview on Late Night with Jimmy Fallon, the Cuffs star told the host how he met his bride at the Little Palm Island Resort in Miami.
"This girl came walking along with another lady, a slightly older lady," Slater explained. "I was sitting in my usual spot, eating my oatmeal ... and this spot was famous for people proposing to each other. It was very, very nice. So she's there, and the next thing I know, she gets down on one knee."
What Slater thought was a "lesbian engagement" turned out to just be a joke.
"It intrigued me, and the next thing I knew we were hanging out in the Everglades," said Slater.
This will be Slater's second marriage. He shares two children, Jaden, 13, and Eliana, 11, with ex-wife Ryan Haddon.