STAR: Cybill Shepherd’s son [pictured above in his mother’s arms, circa 1987] was grounded at Philadelphia International Airport Tuesday after being accused of stealing from the carry-on bags of his fellow passengers. Cyrus “Zack” Shepherd-Oppenheim – the 22-year-old son of the Moonlighting star – rifled through the luggage of two sleeping travelers during a flight from San Francisco to Philadelphia on Monday night, two witnesses told authorities. In one case, he allegedly stole a Canon from a woman and dumped the rest of her things – including a makeup bag – in the trash can of a plane bathroom. From the second victim he’s accused of taking money and documents, disposing of other papers in the same garbage can. When the flight landed in Philadelphia, the actress’ son was taken to an airport holding cell, where the missing documents were recovered. He was charged with Theft-Unlawful Taking and Theft-Receiving Stolen Property. MORE