It was 'American Idol' vs. 'X Factor' at the iHeart Radio festival in Las Vegas this weekend. 'Idol' judge Steven Tyler performed his solo hit 'Feels So Good' with a vocal assist  from sultry 'X Factor' judge Nicole Scherzinger.

The two heated up the stage by bumping, grinding and getting close and up in each other's grill before even singing a note. That's certainly the way to set the table for a performance with their bodies! They looked so good, to borrow a phrase from the song's lyrics.

Nic wore a short, silvery dress with a hood, which showed off her enviable gams, while Tyler rocked a massive pair of sunglasses. Their body language was enough to make their significant others do a double take. It was some blazing chemistry. It was a sizzling enough to make you forget that the two are on opposite, competing reality talent shows on the same network.

All is far in love, war, performing and reality show judging tables!

Watch Steven Tyler and Nicole Scherzinger Perform 'Feel So Good'