Khloe Kardashian and Mario Lopez -- We'll Be Your 'X Factor' Hosts

Khloe Kardashian and Mario Lopez will join the payroll of "X Factor" -- TMZ has learned, Khloe and Mario will be the new co-hosts of the show.

We're told the final, tiny finishing touches are being put on their deals, but the announcement will be made some time this week.

We're told the duo's salaries will add millions on top of an already enormous talent budget ... with Britney Spears in the lead at $15 mil.