They weren't there just to chat with Jimmy Fallon: He also had them show off their Hawkins happy feet in a Stranger Things-themed Dance Battle. RELATED: Adam Lambert's Voice Is Velvet Singing "I ...

"Oh my god. They're backstage kind of showing me the moves." Fallon jokingly compared it to "Dance Moms" with a role rehearsal as Gosling's daughters were coaching him, saying "Big smile dad." ...