Simon Cowell is ready to rumble. On Tuesday night, the 'American Idol' judge had some fighting words for competitor 'Dancing With the Stars.'

During his critique of contestant Didi Benami, the saucy Brit judge threw in a sly jab at the sequined reality competitor on another channel.

"You have no longer made yourself contemporary, everything is too old-fashioned. If you listen to one of those dancing shows, they always have a singer murdering a song on it," Simon said as fellow judge Randy Jackson laughed in the background.

He didn't stop there.