GROSS! Lady Gaga Barfs On Stage (VIDEO)

Party til you puke! 

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Lady Gaga pulled a Justin Bieber while she performed her smash hit "Edge Of Glory" in Spain over the weekend. As she was "singing," Lady Gaga turned around and started throwing up on stage.

Trying to keep the party going, Lady Gaga kept performing as barf spewed out of her mouth, literally.   

While Justin Bieber joked on Twitter that he had "bad milk," Lady Gaga joked on Twitter that she hoped no one noticed her puking on stage. 

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Lady Gaga tweeted: 

"Was praying nobody saw but actually its quite a good laugh if u need one! 

Welp Gaga, the fans see EVERYTHING! 

Although the "Bad Romance" singer didn't offer an explanation about puking on stage, we wonder if it's possible Lady Gaga is carrying a "baby monster?" 

Probably not, but hey, you never know. 

Check out Lady Gaga's gross moment on stage above!