(Cover) - EN Showbiz - Britney Spears left the set of her new show The X Factor after reportedly being irked by a contestant's performance.

The pop songstress experienced her first day as judge on Simon Cowell's US TV talent programme Thursday.

TMZ reports that Britney, who co-judges with Simon, Demi Lovato and L.A. Reid, didn't appreciate one performer's rendition of her song Hold It Against Me.

When the unidentified crooner belted out her tune, Britney quickly left the judging panel. Audience members report that Britney was visibly upset.

A source close to production informed the website that Britney wasn't angered, the star simply "needed a break."

Britney took her time on her much needed respite, as four contestants performed to three judges and an empty chair.

Britney took to Twitter to express her thoughts on her first day on the job.

"Texas has a lot of talent - seriously! Loving @TheXFactorUSA auditions so far... (at X Factor)," she tweeted Thursday.

The star is still the subject of a conservatorship order following her 2008 meltdown, which means her personal and professional decisions are overseen by her father Jamie and some others including her fianc Jason Trawick. (C) Cover Media