Christina Aguilera praises Britney's US 'X Factor' involvement

Christina Aguilera has praised fellow talent show judges Britney Spears and Mariah Carey, describing their appointments as "cool".

Spears is a new recruit to the panel of The X Factor USA, while Carey has joined American Idol.

Matt Sayles/AP/Press Association Images

Aguilera told Extra: "It's actually cool that these strong women are joining the club and they're going to have fun.

"Britney's so talented, I mean, she's a pro. She's been at it for a number of years now. We did grow up together, basically."

The Voice coach added: "I just found out about [Mariah Carey joining American Idol] last night.

"You know I love that. All these artists are coming together from all the experience that we've had and we're being able to take that and feed this new wave of talent coming up."

Aguilera was joined by Green Day's Billie Joe Armstrong for the interview, after he was announced as a mentor for the third season of The Voice.

"He's had a tremendous amount of success in the business," the 31-year-old said. "I like to switch it up. This one was very intriguing because he comes from a completely different genre of music than I do.

PA Images / Anthony Harvey/PA Wire

"He's had tremendous obvious stage experience and touring and [I think] he would have some amazing advice and input."

When asked whether the pair will duet on the show, Aguilera replied: "We'll see stranger things have happened."

Watch the video for Maroon 5 and Christina Aguilera's 'Moves Like Jagger' below:

> Simon Cowell 'spends $500,000 on hotels for X Factor USA hopefuls'> 'X Factor' Simon Cowell: 'Britney's a great judge, Demi's a brat'> Simon Cowell holds up X Factor USA auditions by stopping for breakfast

•