We've been hearing about it for so long that it may seem like old news that Demi Lovato and Britney Spears will be joining the judges panel on The X Factor, but the official announcement was only made yesterday.

The show's new season may still be several months away, but Brit and Demi took their first step toward silencing haters by appearing at the Fox upfronts yesterday on time, seemingly sober, and looking damn good. Both ladies have troubled pasts, to say the least, and there's been talk of producers fearing erratic behavior and public meltdowns.

Host Simon Cowell says he's not concerned and judging from these pics, why should he be? Yes, Brit and Demi have had their problems, but they also both have reputations as hard-working professionals. Don't expect any diva-like, Lindsay on Glee behavior.

(Photos: WENN, Fame/Flynet, Twitter)