Simon Cowell, Fifth Harmony

SIMON COWELL is back! The controversial judge behind such mega-hit TV shows as "American Idol" and "Britain's Got Talent" is sharing his famously blunt opinions on the recent season of "The X-Factor." He's worked with some of the biggest celebrity judges on the planet, and he's telling Ellen about all of it today! The star and new dad is also showing off his exciting musical project Fifth Harmony, and likely hoping to score a few more matching baby clothes from Ellen's special Simon-esque stash... because those mini-me jeans and tees were simply the cutest!

Then, with the support of their toughest critic at hand, FIFTH HARMONY is taking the stage! The American girl group formed on the second season of "The X-Factor" and took the world by storm with singles like "Miss Movin' On" and "Better Together." Now, they're bringing it live to show Ellen and the world why Radio Disney called them "The Next Big Thing."

After opening for Demi Lovato on her Neon Lights Tour, watch them show Ellen how it's all going down.

On Thursday, Ellen's got the talent!