Britney Spears, Demi Lovato to join "The X Factor"

(CBS News) After weeks of speculation, Britney Spears and Demi Lovato have officially announced they will join "The X Factor" as judges.

Both stars appeared at Fox's Upfronts on Tuesday in New York to announce the news.

Spears, 30, tweeted the news by posting a photo of herself, alongside Lovato, Simon Cowell and L.A. Reid of "The X Factor":

Lovato, 19, followed suit on her Twitter page:

The announcement comes after a major shake-up after season one, which ended with both Paula Abdul and Nicole Scherzinger leaving the show.

There's no word yet on who will replace Steve Jones as host.

Tell us: What do you think about Britney Spears and Demi Lovato as "The X Factor" judges?