Jason Derulo is firing back at a man who sued him over alleged injuries he suffered after falling at the singer’s $3 million mansion, Us Weekly can exclusively report. Juan claimed he was fired after Alvaro refused to sign paperwork releasing Derulo from any liability over the alleged injuries. He filed a defense to the suit arguing that any alleged injuries suffered by Juan and Alvaro were caused by third parties, not him. Related: Jason Derulo Runs 1 Mile in New York City Wearing Leather Pants Lenny Kravitz isn’t the only celebrity to challenge the definition of athletic wear. Jason Derulo went for a run in leather pants.