The Maroon 5 singer – who mentors on the competition alongside the blonde beauty, Cee Lo Green and Blake Shelton – decided to improve his manners when he realised the ‘Ain’t No Other Man’ hitmaker is surrounded by males when she shoots the programme,he told Rolling Stone magazine: “I honestly just recently started realising that you’re surrounded by three dudes all the time, and that has to be something of a pain in the ass. We stopped farting in front of her!”

Christina – who recently worked with Adam on Maroon 5′s ‘Moves Like Jagger’ hit – admits she has to be a “pretty strong girl” to put up with the “crazy” testosterone-filled environment during filming, she added: “You have to be a pretty strong girl to stay up in the mix with the guys. It’s a lot. It’s a crazy locker-room kind of situation.”

The 31-year-old star finds the show – which sees mentors pick contestants without seeing them in order to judge them purely on their vocal ability – is a “very good outlet” for her to share “highs and lows” about her life.

Christina – who has son Max Liron, three, with ex-husband Jordan Bratman – explained: “You have got to be a strong, powerful, very confident woman. Being in a position to coach these young women, I am happy to be able to share that with them and share my highs and lows. Being on the show, it’s a very good outlet.”