The Wanted hit out at Christina again

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 TMZ.com: ''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 behavior.

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.' ''