LOS ANGELES - Mel Gibson's only daughter, Hannah, married blues-rock guitarist Kenny Wayne Shepherd this weekend. Gibson, 26, and Shepherd, 29, of Benton, La., exchanged vows in California on Saturday, People magazine reported on its Web site. Shepherd's albums include "Ledbetter Heights" and "Live On." He proposed to Gibson on New Year's Eve 2004 in Rome, according to The Times of Shreveport, La. Gibson, 50, and his wife, Robyn, have seven children. Hannah is their oldest child and only daughter. The wedding came almost two months after Gibson, 50, star of the "Lethal Weapon" movies and director of "The Passion...