Gwen Stefani appears to not be feeling too great right now.

The 50-year-old star revealed on Friday that she had to cancel her upcoming "Just a Girl" show on Saturday at Planet Hollywood’s Zappos Theater because she's still under the weather.

"I am so sorry, but I am still not feeling well & will be unable to perform my #JustAGirlVegas show Saturday, February 8 at @ZapposTheater at @PHVegas," Stefani tweeted, adding that refunds will be available.

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The "Hollaback Girl" songstress continued: "I am doing everything I can to get well & plan to be back on stage for my shows February 12 – 22. Thank u for all of the well wishes. Hope to see you back in Vegas soon. gx #onlyhuman #imsorry #loveuguys."

The news comes just two days after Stefani shared a clip of her dancers preparing for the Vegas residency.

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Last month, Stefani took the stage at the Grammys with boyfriend, Blake Shelton, where the pair performed their hit duet "Nobody but You."

"It wasn't written as a duet," Shelton, 43, revealed to Ryan Seacrest on the award show red carpet about the tune.

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He added: "Once we listened to it, we realized it's actually a perfect duet, you know? Especially for us. The lyrics of the song fit our story perfectly."