Britney Spears and Demi Lovato Win Simon Cowell’s ‘X Factor’ Vote: ‘One of the Best Days Ever’ (EXCLUSIVE DETAILS)

Dylan Howard / May 25, 2012

Celebuzz on Pinterest!
Celebuzz loves to Pin! Follow us for more celeb fun!
New judges Britney Spears and Demi Lovato are definitely through to the next round, this according to their X Factor boss Simon Cowell.

“He thought it was one of the best judging days he’d ever done,” a source close to the show — which held auditions in Austin, Texas on Thursday — told Celebuzz.

“Simon just loved the first day.”

As we were first to report, there was a lot of fun and frivolity on the set with Lovato, 19, at one point calling 52-year-old Cowell “old and impatient.'”

Later, ex Idol mouth Cowell was joking about a contestant butchering one of Lovato’s own songs to which the “Skyscraper” songstress snapped back at the show head honcho: “At least I have a song Simon!”

Cowell responded, “Demi, I think you need to sit in the naughty chair for a few minutes today.”

The insider, who watched from the audience, told Celebuzz: “Austin had a lot of incredible auditioning but it was a big day for new judges too and no-one knew what to expect,” the source added.

“But Simon thought both Britney and Demi were really great. Demi was really confident right from the start and took both Simon and L.A. (Reid) on.”

The judges took to Twitter to review their day, too:

Spears, 30, though had a controversial start to her X Factor tenure, reportedly leaving the set after being irked by a contestant’s performance.

That’s not true, according to our show insider.

“She took a break … for about 15 minutes – it wasn’t a big deal. She didn’t walk off, all the judges had a break,” the source said.

Members of the audience suggested Spears was visibly upset when an unidentified contestant belted out a version of her song “Hold It Against Me,” prompting her to quickly leave the panel.

“Britney looked a little shy in the first few auditions but by the second session she was really getting into it,” the source added.

“Right from the start, Britney knew what acts she liked. She wasn’t scared to disagree with Simon either.

“At one point in the afternoon, she even told Simon he was being too rude. Then a group performed and Britney started dancing and Demi joined in. “

Said our onlooker: “No-one knew what to expect on the first day –  but they were all very happy.”

Team Simon or Team Demi? Comment below.