VIDEO: Casey Abrams Kisses J.Lo On American Idol, Steven Tyler Curses In Delight

April 21 2011, Published 6:30 a.m. ET

Casey Abrams better steer clear of Marc Anthony.

After the scruffy 20-year-old delivered a passionate performance of Maroon 5's Harder to Breathe on Wednesday's American Idol, he kissed Anthony’s wife, judge Jennifer Lopez.

"You did what I've been trying to do for four months!" judge Steven Tyler told the Idyllwild, California native after the surprise smooch. "There are millions of people in America that are really angry, because you p***ed them off because you're so f***ing good!"

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Abrams broke out with a stunned smile, before judge Randy Jackson reminded Tyler they were on live TV -- censors did catch the gaffe, by the way.

The Aerosmith rocker revised his take to "Darn good!"

"You did what I've been trying to do for four months!" judge Steven Tyler told the Idyllwild, California native after the surprise smooch.

Another interesting twist on Wednesday's show, in which competitors had to sing songs from the 21st Century, was the return of the six contestants who've already been eliminated from the top 13.