Well the elder pop princess claims it is her 20-year-old X Factor co-judge who she told us Tuesday night is a "spitfire."
The two divas are the chosen ones to breathe new life into the second season of the talent competition show and there won't be any shortage of fireworks according to the 30-year-old singer.
Okmagazine.com spoke to Brit Brit at the premiere held at Grauman's Chinese Theater in Hollywood where she weighed up who was harder to please.
"I think Demi is a tougher judge. I just feel like she's a little bit younger than me - she is a spitfire!" the Toxic songstress said.
Demi agreed with a laugh: "I am a bit of a spitfire - it wouldn't be the first time I've been called that."
And she also claimed that there was no competitiveness between them as would be expected.
"I don't have any rivalry with Britney, friendly or not, I have no rivalry with her," Demi insisted. "I have a rivalry with Simon though. And you know what - it's not so friendly."
But Simon Cowell believes that it's only a matter of time before the claws come out between the two girls and he can't wait.
"There is currently no rivalry between Britney and Demi… but that changes when it gets to the live shows because then you are mentoring against each other - and that will change." Simon said gleefully. "I love that."
Demi and Britney are confident in their roles now but it took some getting used to.
"I think that we've grown because we've gotten more comfortable," the Skyscraper singer said.
"I think that when Britney and I first started on this show the first episode we were looking at each other like, 'What do we do?' I'm so nervous and she was like, 'I know me too.' But we've gotten more comfortable and more comfortable in telling our opinions without being affected by the booing."
Simon added that the girls are "really, really good."
"They bring the excitement and star power to the show and they've done a great job. I think Britney is having a great time. She is really enjoying doing something other than singing. I think she is really enjoying being part of a team."
Meanwhile, Us reports that all alcohol was banned from everywhere that Britney traveled to across the country during the auditions phaze.
"Very important: We require you to empty the minibars of all alcohol," a hotel rider for the mother-of-two read. "And no gifts of wine or any other alcoholic beverages, please."
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