The Wanted have apologised to Christina Aguilera after calling her a ''total b***h''.

The 'Glad You Came' hitmakers - who are made up of Tom Parker, Max George, Siva Kaneswara, Nathan Sykes and Jay McGuinness - admit they ''shouldn't have'' slammed 'The Voice' judge after claiming she refused to acknowledge them on the set of the US talent show.

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

''The rest of the judges were really nice and she didn't look at us or even talk to us but we apologise for the comment but we get a bit frustrated. It's just Common courtesy.''

Last week, Max claimed the 31-year-old singer was ''scary'' and refused to talk to them when they met her, while Nathan claims Christina even ignored Justin Bieber when he tried to embrace her.

Max explained: ''She was a bit scary to be honest.''

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'.''