“30 Rock” (8:30 p.m., NBC): A new episode of “30 Rock” is always worth

“30 Rock” (8:30 p.m., NBC): A new episode of “30 Rock” is always worth celebrating. Tonight, Jack and C.C. (Edie Falco) continue their long-distance relationship with a rendezvous in various cities. Meanwhile, Liz is eager to invest in real estate but must appear before a co-op board to lobby for the apartment she loves. Gladys Knight guest stars.

“Make Me a Supermodel” (10 p.m., Bravo): Seven men and seven women learn the realities of the modeling business in this new unscripted series. Hosted by Tyson Beckford and Niki Taylor, the 12-week show set in New York invites viewers to decide which model-in-training must go home each week. A $100,000 prize and a modeling contract await the winner.

“Celebrity Rehab” (10 p.m., VH1): Celebrities work to clean up their act. Quite possibly a new low in reality TV.

“Soundstage: Jewel from the Rialto Square Theatre” (10:30 p.m., PBS): Whether yodeling or singing an aria, Jewel puts a unique spin on her music in this pre-recorded concert.