The "Applause" hitmaker appeared on Cohen's show "Watch What Happens Live" in September, and a month later, she took to Twitter to share a surprising detail about her recent visit.
She wrote, "So Andy told me they made perfume out of my pee from the trash in WWH (Watch What Happens) dressing room (long story) U HAVE BEEN WARNED IF HE TRIES TO SPRITZ U."
On Tuesday, Cohen finally opened up about Gaga's tweet, telling late night TV host Jimmy Fallon that the bizarre claim was indeed true.
Cohen explained, "Lady Gaga peed in a trash can in her dressing room. It's a long story, but she did. She said on her way out, 'Look, I couldn't get my way to the bathroom, I'm sorry' -- she's a superstar, she's Lady Gaga, she can pee wherever she wants as far as I'm concerned.
"And so I said to our PAs (Production Assistants), 'You guys, we gotta do something with Gaga's pee. That's a pop culture artifact. We could bottle that up and put it somewhere in the (set).'"
He continued, "I have a PA named Ryan and he emailed me and goes, 'Look, Gaga's pee is going to go toxic.' Not because it's Gaga's pee, but just pee goes toxic, apparently. But he found a recipe online where you can make it into something else using alcohol and stuff. He made it into perfume.
"So, we have it in a pretty bottle. I know, it's kind of gross, but that is a pop culture artifact, if you ask me. That is going to be worth something."
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