Hilton Family matriarch Kathy Hilton is becoming a B-list actress in her own right. After making a few cameo appearances on the Emmy-winning daytime drama The Young & The Restless earlier this year, Kathy will have a cameo appearance as the wife of Tom Cruise in the new Ben Stiller/Tom Cruise comedy Tropic Thunder, opening later this Summer.

“She filmed last winter and didn’t even tell her kids because she wanted to surprise them,” a set insider tells In Touch Weekly. “She raved about Tom,” says the insider. “She said he was so warm and friendly and made her very comfortable.”