Astbury and Nash tied the knot over the weekend in Las Vegas prior to The Cult's gig in the city, according to People.
The Cult's spokesperson said in a statement: "[Ian and Aimee] were married on Saturday afternoon, May 26, at the Little Old Church of the West."
Nash and Astbury apparently met when Black Ryder opened for The Cult on a recent tour.
The Cult continue their summer tour in Denver, CO on Wednesday (May 30).
Their ninth studio album Choice of Weapon was released earlier this month.
Watch The Cult's 'She Sells Sanctuary' music video below: