Demi Lovato is being criticized for a prank on her bodyguard that people say involved sexual harassment. The singer told fans on Twitter yesterday a "lady of the night" that she hired to surprise her bodyguard in Las Vegas showed up to his hotel room without permission and groped him. Fans condemned Lovato, with some saying it was a sexual assault. The singer said she knows about sexual abuse and does not need to be educated on it, and also issued an apology.