With Jackson's "Rockin' Robin."
She ends the song with a "caw, caw."
"You have a way of putting your signature on everything you touch," DioGuardi said.
"What a stupid song choice," Cowell said. "The vocals weren't very good, the dancing was verging on ridiculous. The whole performance was just clumsy and awkward."
Adam Lambert is next up with "Black or White." It was an over-indulgent and glorious mess, but hot damn was it entertaining.
"That was, to me, in a totally different league to anything else we've seen and heard tonight," Cowell said. "To make Michael Jackson work you got to be over the top and be comfortable with it and it was an original version."