The singer took to Instagram to apologize to her fans, who had paid more than $1,000 for the privilege of seeing her at her first appearance since breaking up with comedian Pete Davidson in October.
Tickets for the performance will be refunded, and no makeup dates have been determined.
“Vegas, I’m currently working through some health issues and am beyond sorry I won’t be able to see you this weekend,” she wrote. “I love you and so look forward to seeing you and making it up to you next year.”
“Love you the most,” she added. “You’re so funny sometimes man. Thank you for your patience. I will make it worth the wait.”