Christina Aguilera

The Wanted say Christina Aguilera needs to learn some manners.

The 'Glad You Came' hitmakers - made up of Max George, Tom Parker, Nathan Sykes, Siva Kaneswara and Jay McGuiness - branded the singer a "total bitch" last week and while they admit they shouldn't have said it, they still believe she was very rude.

Tom told "We shouldn't have said it, to be honest with you. We just think manners cost nothing, you know what I mean?"

After meeting the 'Beautiful' hitmaker backstage at US talent show 'The Voice' - on which she is a coach - the band were not impressed with her behaviour.

Tom said: "She's a total bitch! She might not be a bitch in real life but to us she was a bitch. She just sat there and didn't speak to us."

Bandmate Max added: "She was a bit scary to be honest."

Siva said: "You know what, she was quite rude."

The boy band also claimed Christina shunned Justin Bieber when he attempted to embrace her.

Nathan said: "She might have been in a bad mood that day - didn't she completely par Justin Bieber as well? He went in for a hug and she was like, 'Get away from me.' "