Credit: Frazer Harrison/NBC © NBC Universal, Inc. Photo: Christina Aguilera and Adam Levine Sing Together

Christina Aguilera may not be coaching on this season of The Voice, but that hasn't stopped her from doling out advice to her former co-stars on the show.

 

As the show's March 25 premiere gets closer, the pop star, 32, implored mentors Adam Levine and Blake Shelton to be on their best behavior for new judge Shakira.

 

"[I] know how you boys can get," Aguilera tweeted March 18, "so watch [the] locker room humor and treat Shakira like lady she is on new The Voice."

 

Shakira, 36, joins Usher, 34, as the new faces filling the swivel chairs left empty by Christina and Cee Lo Green's exits.

 

Luckily, we know that Christina will be watching and even more importantly, we know that she won't have a problem with sharing her opinion on her perspective about how the old and new mentors are handling the new slate of Voice contestants.