*Before Lee DeWyze was crowned the new “American Idol” Wednesday night, the buildup included a number of performances from the Top 12 contestants featuring such surprise guests as Alice Cooper, Christina Aguilera and even the ailing “Celebrity Apprentice” winner Bret Michaels.

But none caused as big a shock as the sudden entrance of Janet Jackson.

With short hair and all, she simply strolled onto the stage after the “Idol” finalists performed a rendition of her 1993 hit “Again.” 

First, she sang her single “Nothing” from her film “Tyler Perry’s Why Did I Get Married, Too?” Then, the crowd went wild as she ripped into her 1986 classic “Nasty.”

Watch below.