Cast updates: Duff approached for 90210

There's been a landslide of casting-related news over the past few days, as pilot season picks up and current shows plot out their season finales.

Leading the list is the new Beverly Hills, 90210, which is assembling its cast of young stars. The departure of Veronica Mars' Rob Thomas from the writing department may have dampened the show's chances, but producers are trying to make up for that loss by attracting some big-name actors.

According to E! Online, people behind the scenes have pitched one of the lead roles to Hilary Duff, the Disney-made starlet who gained popularity as the titular character in Lizzie McGuire. Duff would play Annie, a theater groupie looking to "fit in with the alternative crowd."

Alyssa Milano may also be headed for a lead role in a different show, says The Hollywood Reporter. An untitled ABC pilot is looking at the former Who's the Boss actress as the star of its comedy about a woman looking to break free from her overbearing family. Milano currently has a recurring role in NBC's My Name is Earl.

Bad news (but not necessarily awful news) for fans of the CW's Aliens in America: Adhir Kalyan, who plays Pakistani exchange student Raja in the underappreciated comedy, has signed on for a recurring role on FX's Nip/Tuck, according to OK!. Kalyan will play an awkward teenage medical prodigy who helps out at the plastic-surgery clinic. The critically acclaimed Aliens has yet to receive a pickup order for a second season, and it doesn't bode well that Kalyan is hunting for new jobs.

The post-Battlestar careers of the show's cast continue on. Tricia Helfer--slinky, sexy Cylon Number Six--has signed on to join the second season of USA's Burn Notice as a recurring character. Helfer will play Carla, who up until now was only heard on the other end of a phone.

Firefly vet Nathan Fillion has been cast in the new ABC dramedy Castle to play a mystery author who helps the NYPD solve crimes. Fillion also recurs on Desperate Housewives and starred in the short-lived Drive.

Elsewhere, Naomi Campbell will appear as herself in the season finale of Ugly Betty, Rebecca Romijn will be downgraded to a recurring star on Betty, and Cybill Shepherd will play James Roday's mom on Psych.

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