Mandy Moore and DJ A.M Dating?

Just when you thought Mandy Moore and Wilmer Valderrama were headed for a reunion, now comes this: Moore and Adam "DJ A.M." Goldstein are in the early stages of dating, a source close to the deejay tells PEOPLE.

Moore, 22, and Goldstein, 33, have known each other for years, the source says, but started spending more time together after running into each other at a New Year's Eve party in Miami.