BRITNEY SHOWS HER TRU COLORS...

Girls just want to have fun, y'all!

Brit is getting back on the performance wagon with a one-time appearance in Cyndi Lauper's "True Colors tour.

Spears will join Lauper's tour on June 30, and perform alongside Debbie Harry, Erasure and the Dresden Dolls.

Spears was supposed to audition dancers on Friday but never showed.