Boy band The Wanted say Christina Aguilera needs to learn some manners after claiming the pop star was rude to them and even rejected a hug from tween singer Justin Bieber.
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 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'."
They also claimed they were not allowed to look at Britney Spears while supporting her on tour.
The Glad You Came singers claimed that they were subjected to the diva treatment by the star's team when they were the opening act for her Manchester concert last year.
The group revealed they were not allowed to face her when she exited her venue changing room.
Tom spoke up during an interview on New York radio station Fresh 102.7.
He admitted: "We signed a confidentiality thing that we should never say anything about what happened, but let's tell it anyway."
Siva said: "I was in the hallway with my tour manager. Basically we were looking with a laptop, trying to get WiFi ... facing the middle of the hallway. [Britney's] bouncers came down with her and told us to face the wall."
Tom continued: "As Miss Spears is walking through. We're like, come on!"
Siva added: "We turned around and I faced a wall for about 10 seconds until she got really far away."