Did a fan fart on Demi?

Is there anything worse than embarrassing yourself in front of your favorite celebrity? One fan experienced the ultimate nightmare while meeting Demi Lovato backstage at one of her concerts. "Just finished a meet and greet. Someone legitimately got nervous and farted on me. I guess there's a first time for everything," Demi tweeted after the incident. But it gets worse! When a fan asked Demi "was it one of those rotten-egg-smelling ones or did you just hear the noise?!" she replied. "ROTTEN DUDE!!!! Gross! Guess Demi needs to changs the lyrics to " Heart Attack" to "Fart Attack"!