Kabbalah is en vogue again. Madonna, Donna Karan, Ashton Kutcher and Demi Moore are among the celebs who will fly to Israel for Rosh Hashana to attend part of a tour with 3,000 Kabbalah Center students. During the 10-day pilgrimage to Jerusalem, the Galilee and the Golan Heights, students will learn about Jewish mysticism. Madonna first started wearing the Kabbalah signature red string on her wrist in 1998, prompting a flurry of stars to follow suit.