Britney Spears The Beginning of the X

5/24/2012 12:40 PM PDT

Britney Spears -- Begins Shooting "The X Factor"

So it begins ... Britney Spears just showed up for the first day of filming for Season 2 of "The X Factor" in Texas -- wearing a slim-fitting breast-accentuating pink dress, black heels, and a big smile.

Auditions are set to kick off any minute at the Erwin Center in Austin -- and we're told Britney's fellow "X Factor" judges Simon Cowell and L.A. Reid are there too.

Demi Lovato also showed up ... and got dissed by a fan holding a sign that says, "Go Britney." 

Always tough to be last.