Lady Gaga Fires Up a Doobie On Stage in Amsterdam [VIDEO]

"When in Rome" so the saying goes. Lady Gaga knows that for sure. Mama Monster smoked pot onstage during a gig Tuesday night.  Luckily she was in Amsterdam so she wasn't breaking the law. But with the young nature of her fan base was she being a good Mama?

Someone threw a bag containing a joint and a lighter up onstage, and Gaga fired it up!  She also told the crowd what a fan she's become of the stuff. She said, quote, "I want you to know it has totally changed my life and I've really cut down on drinking.  It has been a totally spiritual experience for me with my music."

Check it out: