Adam Levine is terrified of Shakira.

The Maroon 5 singer will be joined on The Voice by the singer and Usher next season when they replace Cee Lo Green and Christina Aguilera, but he has no plans to subject her to any initiation ceremonies because he knows the pregnant star is more than a match for him.

"[Fellow coach] Blake Shelton and I don't have it in our hearts to do anything terrible and I know Shakira, she could knock me out," he said.

While he is excited about working with Shakira, Adam will miss Christina, despite their bickering on the show: "We never hated each other. It was just silly bickering, like brother and sister. That's in the past, I'll miss her next season."