Lady GaGa has been hiding a secret as she performs on her current tour - she's been rushing off stage each night to be sick due to her tough routines.
The Poker Face hitmaker kicked off her Born This Way Ball trek last month (Apr12) in South Korea, and she staged her sixth show in Tokyo, Japan on Thursday night (10May12).
And Gaga revealed to fans that it's the only evening she's not had to leave the stage to be sick.
In a post on her Twitter.com page, she writes, "Yes Tokyo! Tonight was the first BtwBall that I didn't puke during show. (yes its that hard) (sic)."
It's not the first time Gaga has battled through illness to perform for fans - she had to vomit in between songs during a concert in London last year (11) after falling sick with food poisoning.