Steve Carell, Ryan Seacrest & 12 Other Surprise Cameos In Knocked Up, Explained

[Greg MacArthur]

There is a remarkable number of celebrity cameos adding to the already star-studded cast of Knocked Up. Often regarded as one of the best Judd Apatow films, Knocked Up stars Seth Rogen and Katherine Heigl at the height of their popularity during the 2000s. Knocked Up also stars Jason Segel, Jonah Hill, Paul Rudd, Leslie Mann, Jay Baruchel, Martin Starr, and Ken Jeong in his feature film debut. Knocked Up originally hit theaters back on June 1, 2007, and became a summer box office hit, grossing roughly $219 million worldwide.

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