She also took to Twitter to address some online reports that she walked off the set after someone who was auditioning offered a less-than-stellar rendition of her hit "Hold It Against Me."
The singer Tweeted: "#Britneywalksoff??? LOL was just taking a little break people. I am having the BEST time!!!"
And a source close to the show tells PEOPLE, "She was not upset. She just took a short break, which is not uncommon for judges to do in these taped shows."
Another source on the production clarified Spears's brief absence, telling PEOPLE, "The judges are allowed to get up at any point. The show isn't so strictly structered as [American] Idol is. When Britney got up, she went to fix a small wardrobe issue and had a bathroom break."
For her part, Lovato was equally impressed with the performers: "Such an amazing day...can't wait to do it again!!! #XfactorUSA," she Tweeted.
And Lovato and Spears got interactive, according to the source, who says, "[Britney] had a great time and even danced with Demi during one contestant's performance."
Britney Spears | Adele | John Mayer | Mary J. Blige | Rebecca Ferguson | Rihanna Leona Lewis | Patrick Wolf | Florence + The Machine | Alicia Keys | Kanye West
Coldplay | Janet Jackson | Grace Jones | Chase & Status | Amy Winehouse Twitter
I feel like I'm missing something. Why are people acting like she went and shaved her head during her break?
Obviously a judge leaving to go powder their nose is completely unheard off.
I mean it's not like they don't do it during the breaks on Live shows do they? Hmm.. people need to do some xFactor research.
But people can stay pressed trying to drag down the Queen while she sits slaying in her throne.
ďIím becoming a little more comfortable in front of the camera. I wasnít used to it before. I was thrown into a new lifestyle and everything I do is kind of filmed or photographed. Iím a private guy. I like to keep to myself. Iím shy, maybe. It gets kind of tricky for me but, Iím beginning to find the fun in it. I donít take myself too seriously so if Iím front of the camera, thatís what youíre going to get, me clowning around."(Bruno Mars)