She also patted herself on the back for carrying on with the show: "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."
Scandal sheet TMZ, citing sources close to the singer, claimed that Gaga was "suffering from the flu" but didn't want to cancel the show.
Check out footage of the incident here (not for the easily squeamish).
It's not the first time Gaga has fallen ill during a concert. The singer bolted it off stage to throw up during a gig in Romania back in August.
When she returned to the stage, she told the audience: "I went backstage and vomited, and I did not want you to see this... It happens to me sometimes."
Last week, the Biebs yakked on stage while performing in Arizona during his Believe tour kickoff.
While performing Out of Town Girl the singer turned his back to the crowd, hunched over and threw up on stage, as seen in a video on TMZ.
He blamed the incident on milk.
"Great show. Getting better for tomorrow's show!!!! Love u... And... Milk was a bad choice! LOL," he wrote on Twitter.
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- Rumour Has It