Naomi Watts is impeccable in a black jumpsuit at the TIFF 'St. Vincent' Premiere

Naomi Watts plays a pregnant Russian prostitute in St. Vincent, but on the film's red carpet tonight (Sept. 5) the Aussie beauty traded her wardrobe of thigh-grazing skirts and pink velour tracksuits for a sleek black jumpsuit.

Naomi Watts © Getty

The low-slung number fit the actress's slender physique to a tee, with side cutouts exposing her toned torso. She paired the zipper-lined one-piece with a dazzling necklace featuring a serpent biting its tail and gold platform sandals.

And while the Diana star, 45, somehow managed to keep her tousled yet sleek ponytail dry, costars Melissa McCarthy and Bill Murray - clad in a crown and a sash celebrating his namesake holiday - were drenched in the downpour.

Bill Murray and Melissa McCarthy © Getty

The film follows an unlikely friendship formed between a carmudgeonly retiree and the little boy who lives next door.

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