September 19, 2011 03:00 PM

Hector Vallenilla/Pacific Coast News

Hip check!

Naomi Watts totes her youngest son, 2½-year-old Samuel Kai, while walking her dog Tuesday in New York City.

Later in the week, we spotted Watts, 42, sitting front row with Uma Thurman at Calvin Klein’s show during Mercedes-Benz Fashion Week.

The actress and her fiancé Liev Schreiber are also parents to son Sasha, 4.

RELATED: Naomi Watts: Liev ‘Sets the Bar High’ for Father’s Day

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