Ben Stiller was left red-faced at a celebrity roast in New York this week - when Robert De Niro told the A-list crowd the comedy star has a small penis.

De Niro, Sean 'Diddy' Combs, Tom Cruise, Mike Myers and Judd Apatow all paid mocking tribute to the actor/director at the Museum of Moving Image on Wednesday night. And De Niro managed the roast of the night, by claiming his Meet the Parents co-star is lacking in the underpants department.

The Raging Bull star claims Stiller exposed himself when he slipped into a pair of Speedos in the 2000 comedy. He said, "You expect him to be flabby and pale. But he's actually totally buff. But he overcomes this contradiction by having a really tiny... And in that suit, it's apparent to everyone."

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(This news article provided by World Entertainment News Network)