Hilary Duff and Foxy Brown are among the seven celebrities with new projects MTV has in development. Little is known about Duff's reality project, which is still being worked out with the cable channel. The "Lizzie McGuire" star also has a comedy pilot deal with MTV's Viacom stablemate CBS, but the projects are not connected.

Brown will star in "Foxy's Family," which follows the hip-hop star as she balances the demands of her musical career with the family who helps her run it.

"7th Heaven" star Ashlee Simpson also will get the reality treatment from MTV, which will follow her as she records her first album. The series, which will be co-executive produced by her father, Joe Simpson, also will delve into her personal life. She is the younger sister of Jessica Simpson, who stars on MTV's "Newlyweds: Nick & Jessica."

Cameron Diaz, Frankie Muniz and Orlando Jones are among the other talents the teen-targeted network has tapped as part of a newly expanded effort to funnel more series into the production pipeline.

The untitled project featuring Diaz, which she also will executive produce, chronicles her adventures at various hot spots around the globe with her friends. The "Charlie's Angels" star also will address environmental issues specific to each location she visits.

Muniz, star of the Fox series "Malcolm in the Middle," will host a series in which he comes along for the ride as real-life high school students live out their fantasies. Jones ("Drumline") will lend his voice to multiple characters in the animated series "Chico & Guapo," which revolves around a pair of janitors trying to break into the music business at the New York hip-hop recording studio where they work.

As reported yesterday, MTV has corralled Sean "P. Diddy" Combs, Kid Rock and Nelly to join Janet Jackson at the halftime show it is producing for Super Bowl XXXVIII on CBS.