Which Star’s Gone Back to Blonde? [PHOTO]

Well, it was fun while it lasted.  Last month a certain celeb ditched her signature blonde locks for a darker 'do.  But now she's lightening up again.  See if you can guess who this is?

Britney Spears!  The pop star hit a post-Oscars party less than a month ago as a brunette, but she seems to have tired of the look quickly.

According to People.com Brit was spotted this week taking her sons to gymnastics practice sporting a much paler hue.  Hey spring is just around the corner right?