Somebody please pass the Pepto-Bismol, pronto!
In a video making the rounds, the 26-year-old can be seen slinking down a staircase with her back to the audience during a performance of "Edge of Glory" in Barcelona. Then, as she makes her way across a stage plank toward a dancer, she abruptly throws up at least four times.
At one point, her backup dancer gently pats her on the back as she tries to hurl inconspicuously.
But you gotta give it to Mother Monster: Ever the pro, she barely missed a beat and continued with the performance.
At least she's getting some good laughs out of it: The "Poker Face" diva poked fun at herself on Twitter Monday morning, posting a link to the video and writing, "Was praying nobody saw but actually its quite a good laugh if u need one! Check out Lady PukeGA doing Swan 'Vomit' Lake."
She also gave props to herself for carrying on: "I still hit my routine mom!! :)," she tweeted. "Thank goodness for the Dorchester...i need some tea, i think i just cried a little watching that."
So what was the gastronomic culprit?
Gaga herself might have provided the answer when she tweeted about lunch a few hours before the performance.
"In SPAIN having the time of my life!!!!!! *eats Paella in the corner*," she wrote. "I love it here so much, my view is beautiful I'm gon rock Barcelone!"
The bum tummy was yet another blow to the songbird, who seems to be having a tough week overall.
On Sunday night, just a day after her puke-fest, Gaga was booed by fans in London during the launch of her new perfume, Lady Gaga Fame, after she arrived an hour late to Harrod's and then skipped out on posing for fans and photogs on the carpet.
Smells like some serious Little Monster discontent there.