Robert De Niro and Bradley Cooper celebrated their Oscar nominations for their roles in “Silver Linings Playbook” over dinner at Sunset Tower Hotel’s Tower Bar in LA on Thursday night. De Niro was nominated for supporting actor, while Cooper got a nod for leading actor. A fellow diner told us, “They didn’t make a reservation, and waited for an hour. But they looked happy. De Niro was overheard saying to the hostess, ‘I totally understand it’s our fault, we should have made a reservation’. Very elegant.”