(Cover) - EN Showbiz - Demi Lovato is said to have officially signed a deal to possibly join Britney Spears on The X Factor.

Britney is believed to have already agreed to a deal to be a judge on the US version of the TV talent show and according to TMZ Demi will also be a panelist.

Sources report to the website that Demi and Britney will announce their new posts for the Fox Upfront in New York City Monday.

Britney is thought to be excited about working with Demi.

"Britney is the anchor of the new judging panel and that was Simon's most important hire. Britney is extremely hopeful that Demi Lovato will become one of the judges because she truly admires her," a source told RadarOnline.com previously. "Britney loves how open and honest Demi has been with her fans after she went to rehab last year. She thinks they have a lot in common and that they would have great chemistry on the show. Britney is extremely excited for filming to begin, which will be in the next month."

If the deals are sealed, Demi and Britney will replace Nicole Scherzinger and Paula Abdul, who left The X Factor last year. (C) Cover Media