• by David Goetzl  @dgoetzl, January 13, 2011

  The number of music competition shows keeps growing. But will the hits keep on coming? Bravo and sister network Oxygen are betting there is room for at least two more. Both nets are turning to established hits to give their new ventures credibility.

On Bravo, former two-year "American Idol" judge Kara DioGuardi will join singer Jewel in headlining "Platinum Hit" this summer. There, 12 songwriters face off in challenges "testing their creativity, patience and drive" with DioGuardi and Jewel as mentor types.

DioGuardi had many fans during her "Idol" run, and Bravo is hoping to draft off that. Ratings for "Platinum Hit" can come in way below "Idol" and still be considered a hit for the cable network.

On Oxygen this summer, the network will air the 10-episode "The Glee Project," inspired by the eponymous Fox musical drama, where contestants battle for a guest role on the series.

Later this year, Bravo is also giving reality-show migrant (and chef) Rocco DiSpirito -- who's had shows on NBC and A&E -- another venture. "Rocco's Dinner Party" has chefs competing to toss a top-notch dinner party for DiSpirito and fellow celebs.

Overall, Bravo said it would boost its amount of original programming by 20% as it moves into a fourth month of five nights of originals.

Also coming to the network is "Million Dollar Decorators" in April, which delves into the lives of interior decorators in L.A. The same month, the network will debut "Pregnant in Heels," following "maternity concierge" Rosie Pope as she advises wealthy expectant moms in Manhattan.

Oxygen is also giving some reality-show staples, Tori Spelling and Paris Hilton, new opportunities this spring. "Tori & Dean: sTORIbook Weddings" premieres in April, with Spelling and her husband making couples' dreams come true with spectacular weddings.

In April comes "The World According to Paris," billed as "behind the Hollywood glamour, red carpets, photo shoots, and fabulous parties stands a strong (Hilton) who's determined to make a new life for herself."