Olsen Twins Celebrating Birthday At Bonnaroo Music Festival

June 13, 2008 4:56 p.m. EST

Nashville, TN (CNS) - Happy Birthday Mary-Kate and Ashley Olsen. The twins, who began their careers as Michelle Tanner on "Full House," turn 22 on Friday the 13th.

According to local news reports in Nashville, Tennessee, the twins have been spotted on their way to the Bonnaroo music festival in Manchester, Tennessee. The lineup for the four-day festival includes performances by Metallica, Kanye West and Willie Nelson.

On their last birthday, the year they turned 21, the multimillionaire moguls celebrated in a quieter fashion. They hosted a family dinner party at Hollywood's Chateau Marmont that included their sister Lizzie, 20, and brother Trent, 24.

The Olsen twins began their career on "Full House" before they celebrated their first birthday.