The Wanted have lifted the lid on Britney Spears' diva demands, just days after they branded her rival Christina Aguilera "rude".

The Glad You Came hitmakers were left disappointed after meeting Christina Aguilera backstage on TV talent show The Voice last month (Apr12), when the Beautiful singer allegedly refused to speak to them.

Tom Parker revealed, "She's a total b**ch. She might not be a b**ch in real life, but to us, she was a total b**ch. She just sat there and didn't speak to us. Wouldn't even look at us."

The singer has now turned on Christina Aguilera's former The Mickey Mouse Club co-star Spears, claiming the Toxic superstar's minders made the band face the wall as she walked past them backstage when they supported her during the U.K. leg of her world tour last year (11).

Tom Parker tells New York radio station Fresh 102.7, "We signed a confidentiality thing that we should never say anything about what happened, but let's tell it anyway."

Bandmate Siva Kaneswaran adds, "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... As Miss Spears is walking through. 'We're like, come on!'

"We turned around and I faced a wall for about 10 seconds until she got really far away."