Spears, 32, who is known for her long blonde locks, flaunted her new look just two weeks after debuting a brunette hairdo on an Instagram picture, reported Ace Showbiz.
The mother of two showed off her new fiery tresses while performing for her residency show at Planet Hollywood Resort and Casino in Las Vegas.
She strutted her stuff in various outfits that included a black leather corset and a sparkly mesh bodysuit.
Spears kicked off her show in the Sin City late December last year and is expected to run around 100 shows.