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Ann Oldenburg, USA TODAY

It's the new, hot on-stage thing to do!

Justin Bieber threw up during his tour opener in Arizona. And now Lady Gaga is following suit.

The star tossed her cookies midsong on stage in Barcelona on Saturday night at the Palau Sant Jordi arena. According to Buzzfeed, she was was singing The Edge of Glory, the 23rd song of her regular 24-song set.

She tweeted out a link to the YouTube video of it, saying, "Was praying nobody saw but actually it's quite a good laugh if u need one!"

Gaga also turned heads with the claw handgear she wore on Sunday in London to promote her new fragrance, Fame. According to Sky News, fans booed Gaga aftershe arrived an hour late and didn't stop to chat with her little monsters.