No, Mila Kunis, 29, isn't stepping out on new boyfriend and former That 70s Show costar Ashton Kutcher, 34 — she's filming a rescue scene for her new flick with Robin Williams, 61, The Angriest Man in Brooklyn, which is filming in New York.

Kunis fished Williams out of the Hudson River on Tuesday for a scene in which his character, who has just learned he has only a short time to live, tries to commit suicide, reports Ace Showbiz.

The Angriest Man in Brooklyn, directed by Phil Alden Robinson of Field of Dreams and Sneakers and also starring James Earl Jones, Melissa Leo and Peter Dinklage of Game of Thrones, is set to hit theaters sometime in 2013.

Kunis, who broke up with longtime boyfriend Macaulay Culkin, 32, after seven years in 2011, has recently started dating Kutcher since his highly public split, also after seven years, from Demi Moore, 49, last year.

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