The 32-year-old singer first hinted at her new do in a tweet posted Sunday, where Spears announced "she was going out with a bang."
"This is it!!! Last show until August!" the "Work Bitch" singer wrote. "Going out with a bang tonight. Hope you're ready... ;) #PieceOfMe"
Spears showed off her new blonde look while posing for pictures before Sunday's Piece of Me show. At the time RuPaul's Drag Race finalist Adore Delano took to Twitter to share a photo with the singer.
Spears dyed her hair brown back in February.