Nick Cannon’s got a long road of diva doom ahead of him if those Mariah marriage rumors are to be believed. Nick’s new bride, who reportedly demanded “special lighting” for her April appearance on American Idol and even chastised a backup singer during a live performance on Good Morning America last Friday, left an eight year old fan in tears during a CD signing at the Hard Rock Cafe in Hollywood on April 17th. (There’s still time to haul ass, Nick!)

The trouble started when Mariah waltzed into the event nearly three hours late:

“That really ticked off the Hard Rock staff, because they had to close the restaurant during her no-show time-which caused them to lose business,” a source told The National Enquirer.

“She acted like a total diva, walking around with a bad attitude, disrespecting employees and fans.”

“This little sweetheart stood in line waiting with her mom for hours,” the spy went on. “When she finally got to Mariah, she was completely dismissed. Mariah told her to get out of line because she was in the way of fans who were buying her CD. Mariah was so huffy and rude, the little girl burst into tears.”