The Wanted's Tom Parker has shed some light on why he called Christina Aguilera a "total bitch" during a radio interview.

As previously reported, Parker went off on one during an interview in the US after the band had appeared on her show, The Voice USA.

He said that she just "sat there and didn't speak" to the band, who performed on the TV talent show. However, speaking to TMZ, Parker apologised for the statement - but they don't take it back. He said:

"The rest of the judges were really nice, but she just didn't look at us or talk to us, d'you know what I mean? We apologise for the comment, but common courtesy..."

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