'Inside The Actors Studio' 250th Episode: Robert De Niro Surprises Bradley Cooper (VIDEO)

Bradley Cooper, who had previously appeared on the Bravo series as a student four times, including asking Robert De Niro a question, was there for the second time as an actor. While on stage, De Niro came out and surprised his "Silver Linings Playbook" co-star, which received a standing ovation.

The 250th episode celebration of "Inside the Actors Studio" also included a look back at favorite guests -- Robin Williams was the viewer's choice -- and dissecting why the show and format have been so successful. According to Katie Couric, it's because Lipton makes guests comfortable enough to reveal facts about themselves.

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