Sasha Fierce is back ... and blonde!

In a new Pepsi commercial, Beyonce shows off some behind-the-scenes footage from her unreleased single "Grown Woman" and although the clip is only 12 seconds long, Bey shows off a brand new hair color.

The teaser video also shows B practicing her dance moves for the video, and one point, she throws her new blonde hair into a '60s-inspired beehive.

"Grown Woman" is the first track off her new album, Mrs. Carter.

It's been a busy few months for Beyonce, as her Mrs. Carter Show World Tour kicks off April 15 in Europe.

Watch the trailer below.