Ever the savvy businessman, Simon Cowell has come up with a fool-proof plan to save the troubled 'X Factor': Hire Miley Cyrus as a judge!

Simon revealed his dream addition to the judging panel yesterday (Dec. 18) after it was confirmed that Demi Lovato would not be returning to the reality-competition show.

Whether or not 'X Factor' will return for a fifth season is in doubt, because of sagging ratings. Cowell, who executive-produces the series as well as appears on it as a judge, knows that bringing in Miley would put a wrecking ball to previous numbers, racking up an enormous amount of viewers. She isn't one of Barbara Walters' Most Fascinating People of 2013 for nothing!

While the world can agree that the entertainment value of Miley twerking on Simon would be priceless, he has his own reason for choosing her: "She's got a big mouth!" he says.

Cowell also reveals he's cool with Lovato's departure. "I always thought with Demi it'd be a maximum of two years because she has the tour next year," he told E! News. "People leave and they come back, we're used to that on our show. So the door's open."

The 'X Factor' season finale airs tonight (Dec. 19) at 8PM ET on Fox.