Shelton appeared on The Tonight Show Starring Jimmy Fallon last week, where he was asked about the first song he'll dance to with Stefani as husband and wife.
"I think it's called the wedding march," Shelton, 44, quipped before host Fallon clarified he meant his first dance song.
Shelton then pulled out his phone and said, "It's 'If You Leave' from the Pretty In Pink soundtrack. We talked about this. We both love the song. We're both fans of the '80s, why not? Don't you think that would be a great one, though? We've literally talked about that."
"We're keeping it very simple. Really simple," the "Let Me Reintroduce Myself" singer said last month on Late Night With Seth Meyers. "I think the guest list will not have a lot of musicians. It'll be, like, my mom and my dad. It's literally going to be just family. We are looking forward to that, though."