You have to forgive Christina Aguilera for not immediately recognizing a singer who auditioned on The Voice last night.

After all, it's been nearly two decades since she and Tony Lucca were on The Mickey Mouse Club together. 

"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."

However, it was Adam Levine who eventually got Lucca to join his team, by telling him he "pushed two buttons" -- his own and Cee Lo Green's.

After Lucca left the stage, Aguilera realized who he was and ran backstage to find him.

"You know who that guy was? I was on the Mickey Mouse Club with him. That is so weird!" she said. "Where is my old Mouseketeer buddy?"

After locating him backstage, Aguilera revealed a secret about Britney Spears, their other Mickey Mouse Club co-star.

"Britney had the biggest crush on you," she said. "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?"

Aguilera apologized for not recognizing Lucca, telling him "no hard feelings."

Tags: Christina Aguilera