"Okay, so I woke up kind of 10 times worse and it hurts so bad to swallow," Grande said directly to fans in an Instagram video Sunday afternoon. "I'm not really sure what's going on, but I unfortunately don't think I will be able to push through tonight and I'm so upset and sorry."

"Ugh. I'm so upset, but of course, obviously you’ll be refunded, etc. I’m just devastated. Thank you for understanding and sending love, etc., whatever. I'll keep you posted as soon as I know what's going with my body, but thank you for understanding, and I am so sorry," she added.

Grande was scheduled to perform at Lexington's Rupp Arena. The venue's Twitter page advises that ticketholders can receive a refund at point of purchase. Refunds will be processed automatically for tickets purchased through Ticketmaster, and those who bought tickets through Lex Center Tickets can obtain refunds by calling (859) 233-3535.

See Grande's video update below, which was originally posted on on her Instagram stories.