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"Gossip Girl" star Penn Badgley wants the skinny stars of "90210" to plump up -- and he knows just how. "I hope they eat a double cheeseburger or something," he told PopEater.com, as reported by Us Weekly.

Starlets Jessica Stroup, 21, and Shenae Grimes, 18, have come under fire for their waiflike frames -- and with Stroup reportedly at 100 pounds and Grimes at a measly 90, castmates are reportedly worried.

"They just don't eat, and the hours of that show are going to get to them if they don't get healthy," a source told Us Weekly.

As for Badgley's own "Gossip Girl" cast? He thinks it's "healthy" that the girls -- Leighton Meester and Blake Lively -- "aren't bone-thin."

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