It's been nearly two decades since Christina Aguilera last shared the stage with Tony Lucca -- which might explain why the five-time Grammy winner didn't immediately recognize The Voice contender.
Lucca, 36, covered Ray LaMontagne's "Trouble" on The Voice's Season 2 premiere Sunday, earning praise from Aguilera, 31, Cee Lo Green, 37, Adam Levine, 32, and Blake Shelton, 35.
"It does take a true talent to come along and jolt us out of our seats to push our buttons," Aguilera told Lucca. "You have such a beautiful, silky quality to your tone and I appreciate you for making us all push our buttons."
It wasn't until Lucca left the stage that Aguilera realized they both appeared on Disney's Mickey Mouse Club in the early '90s. Feeling embarrassed, Aguilera jumped out of her seat and headed backstage to find Lucca.
"You know who that guy was? I was on the Mickey Mouse Club with him. That is so weird!" Aguilera told her fellow coaches. "Where is my old Mouseketeer buddy?"
"Britney [Spears] had the biggest crush on you," Aguilera revealed. "She'd talk about you all the time -- and she wouldn't mind me saying that. Back together on TV! Hello? Does it get better than that?"
The Voice continues Monday at 8 p.m. EST on NBC.