Gwen Stefani, who is currently headlining a residency in Las Vegas, had to cancel her gig tonight because she is too ill to perform.

The “Hollaback Girl” singer was slated to play Planet Hollywood’s Zappos Theater but isn’t going to make it to her show tonight. On Tuesday, she took to social media to apologize.

“I’m so upset to share that I am unwell and will not be able to perform my Vegas residency show tomorrow night,” she wrote in a post on Twitter. “I was so looking forward to seeing everyone and performing and wish I wasn’t feeling the way I do. To everyone who was coming to Wednesday’s show, I am so sorry. I am doing everything I can to be back on stage Friday.”

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Live Nation shared Stefani’s post, writing “Feel better, Gwen!” The promoter said that refunds for Wednesday’s show will be issued at point of purchase.

This Friday is Stefani’s final gig for the current run of the I’m Just A Girl residency before she picks it up again in October. Late last year, she extended the residency by eight months with 21 new shows. While she was originally slated to end the trek in March, she will wrap-up shows in November.

Stefani, best-known for early 2000s albums like The Sweet Escape and Love Angel Music Baby, previously described the residency as an “incredible honor,” telling People that “it feels like a chapter.”

“You look at it and reflect on it with joy and gratitude and you realize how that was magic… ,” she said. “You can’t really see that while it’s happening because you’re in it. It just feels so good to get to this point.”

Grab tickets to see Stefani during her residency via Ticket Club.

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