Britney Spears poses March 5, 2009, with her two sons Preston (left) and Jayden (right) in Mickey's Toontown Fair at the Magic Kingdom in Lake Buena Vista, Fla.

Spears and her son Jayden also took a turn with Spears' assistant, Brett Miller, on the Tomorrowland Indy Speedway attraction at the Magic Kingdom in Lake Buena Vista, Fla.

Spears just kicked off her international "Circus" concert tour. The Magic Kingdom is one of four parks at Walt Disney World Resort.

Photos taken by Diana Zalucky.