Britney Spears' ticket sales are "down considerably." The "Womanizer" singer is concerned her comeback tour, 'The Circus Starring Britney Spears' will flop after a large number of concert tickets remain unsold for the opening show in New Orleans tomorrow.

The Pussycat Dolls "sacrifice everything" to stay in shape. Singer Kimberly Wyatt revealed the girls are forced to give up their favorite foods and exercise for hours to maintain their super-svelte figures.

She said: "The show is really tough on our bodies - we sacrifice everything. We have to take care of ourselves and we do that to the best of our ability."

Lady GaGa has vowed to be "bigger" than Madonna.

The "Just Dance" star insists there is no limit to her ambition and will not to stop working until she is more successful than her idol.

Ne-Yo says Michael Jackson's comeback could be the "greatest ever." The R'n'B singer - who is currently touring with the Pussycat Dolls - has been writing songs for the "Thriller" singer's new LP, and admits he is incredibly excited about Michael's material.

He said: "I've been submitting songs and he's been picking the ones he likes. But I've no idea when the album will come out. That's a question for Michael."

Lewis Hamilton was interrogated by the Pussycat Dolls before he could date lead singer Nicole Scherzinger. The sexy girl group wanted to make sure the 24-year-old Formula One racing driver was a "nice guy" and not "a playboy."

Melody Thornton, 24, said: "When we found out Lewis was a racing driver we were like, 'Hold on a minute, he better not be a playboy.'"