Vocal sensation Christina Aguilera has given some advice to her former colleagues on 'The Voice' and told them to watch their behaviour around new judge, Shakira.

Although Aguilera decided not to sign on for the new season of the popular TV talent show, she is still checking in with her friends Blake Shelton and Adam Levine and tweeted (March 18):

"Know how u boys can get @adamlevine @blakeshelton so watch locker room humor & treat @shakira like lady she is on new #TheVoice. #girlpower."

Upon seeing the friendly warning, songstress Shakira thanked the 'Your Body' hitmaker and publicly replied: "Thanks for looking out @xtina! Shak #TheVoice."

Shakira, meanwhile, recently joked that she won't put up with any messing from the rest of the panel and said: "Oh no I don't take any advice from these guys. These two guys have been here three season - they are almost deaf! I have come here to be a mentor to people who have dreamed like I once have."

Watch a promotional video for 'The Voice' starring Shakira below: