XXX is the thirteenth studio album (also including live material) by the American rock band ZZ Top, released in September 1999. The album's title commemorates the band's 30th anniversary.

Billy Gibbons – guitar, vocals
Dusty Hill – bass, keyboards, backing vocals, lead vocal on "(Let Me Be) Your Teddy Bear" />Frank Beard – drums, percussion

Jeff Beck – guitar on "Hey Mr. Millionaire"
Ross Mitchell - spoken vocals on "Introduction by Ross Mitchell"

Producer: Billy Gibbons
Engineer: Joe Hardy
Assistant engineer: Gary Moon
Mixing: Joe Hardy
Mastering: Bob Ludwig
Digital editing: Brad Blackwood
Recording: Joe Hardy
Art direction: Bill Narum