Jessica Biel Climbing Mt. Kilimanjaro

The cause is the worldwide clean water crisis, and it brought out Jessica Biel, Emile Hirsch and several other notables to climb Africa's tallest peak.

The group is in its second day of the trek, with supporters pledging money for every foot they climb.

Jessica is a novice mountain climber but is in such fantastic shape from her daily fitness routines that she's reportedly more than holding her own.

The climb was organized by Summit on the Summit.

Click here to see photos of Jessica starring in Guys & Dolls on stage.