BRITNEY SPEARS Almost Quit 'X Factor' ON DAY 1

Britney Spears tried to back out of her $15 million "X Factor" deal on the VERY FIRST day of production ... after experiencing a panic attack on the set ... this according to Simon Cowell. 

Britney Spears Storms Off "X Factor" Set

Britney Spears walked off the set of "X Factor" moments ago ... and according to several people in the audience, she was upset after a contestant butchered her song, "Hold It Against Me."

BRITNEY SPEARS Closing $15 MILLION Deal To Judge 'X Factor'

Britney Spears and "X Factor" have struck a deal that will line the singer's pocket to the tune of $15 million for next season.