Britney Spears struggled to contain her nerves on the first day of filming the U.S. version of ‘ The X Factor’ and suffered "panic attack after panic attack".
The pop superstar signed up as a judge for the reality TV show earlier this year and she recorded her first appearance in May – but Spears admits she got off to a shaky start.
She tells America's Elle magazine, "(I was) extremely nervous. I was having panic attack after panic attack."
However, co-judge and show boss Simon Cowell was on hand to help his new judge through her nerves.
He says, "On the first day, one hundred per cent she didn't think she was going to be able to do this. It's the Roman Colosseum – five thousand people booing if you say no. But I'm seeing this woman blossom week by week doing this. I think she's going to be good for the show, and I think the show is going to be good for her."
X FACTOR VS. THE VOICE
Meanwhile, Cowell fears Spears will be "devastated" after rival American TV bosses decided to put her head-to-head with rival Christina Aguilera in a small screen ratings battle.
The music mogul has branded producers behind the U.S. version of The Voice "cold-hearted" for scheduling an extra episode of the TV talent show at the same time as the season premiere of his singing contest The X Factor next week.
The second season debut of the music mogul's Fox show, which features new judges Spears and Demi Lovato, is set to hit screens in America on Wednesday.
However, its launch could be overshadowed by an additional installment of NBC rival The Voice, which features Christina Aguilera as one of the panellists.
Cowell admits he is fuming over the move, insisting he thought he had a "gentleman's agreement" in place over the scheduling of the programmes.
He tells TMZ.com, "This is a cynical, cold-hearted, unprofessional way of doing business. Britney's not going to appreciate the fact that Christina - who has been a bit of a rival – isn't allowing Britney to have a night of her own...
"These guys have really got it in for us. It's nothing short of dirty tricks. The reason they've done this is they don't want people to see X Factor because they've heard how good the series is. They don't want their audience to see Britney Spears. They don't want their audience to see Demi Lovato.
"(Spears is) going to be devastated because she's put her heart and soul into this."