There’s a new power couple in young Hollywood — and they’re an action-movie dream. A source reports that Patrick Schwarzenegger, the 16-year- old son of California Gov. Arnold Schwarzenegger, has been seeing Tallulah Willis, the 15-year-old aspiring actress daughter of Bruce Willis and Demi Moore. “They started dating around Halloween,” our source says. A rep for Bruce Willis denied that the kids are dating.