Sienna Miller displays her lean figure in grey top for stroll in NYC

She recently proved she's not afraid to share her opinion on social issues, after taking to the stage during a Time's Up event last week.

And Sienna Miller cut a casual figure as she stepped out for a low-key walk in New York City on Thursday morning. 

The Catcher Was a Spy actress, 36, showed off her off-duty style in grey gymwear, which featured a patterned tee and skintight cropped leggings - flashing a glimpse at her toned pins. 

Sporty: Sienna Miller cut a casual figure as she stepped out for a low-key walk in New York City on Thursday morning

Sporty: Sienna Miller cut a casual figure as she stepped out for a low-key walk in New York City on Thursday morning

The screen star opted for comfort as she slipped on a pair of sporty black trainers by Nike, tied in grey and purple details. 

Adding a pop of colour into her look, the Alfie actress carried her possessions in a bright yellow handbag as she engaged in a phone conversation.

Sienna kept at a minimum as she sported chic oversized sunglasses and a dainty necklace. 

Slender: The Catcher Was a Spy actress, 36, showed off her off-duty style in grey gymwear, which featured a patterned tee and skintight cropped leggings - flashing a glimpse at her pins

Slender: The Catcher Was a Spy actress, 36, showed off her off-duty style in grey gymwear, which featured a patterned tee and skintight cropped leggings - flashing a glimpse at her pins

The award-winning star displayed her radiant complexion as she went make-up free during her walk, and styled her tresses into an effortless bun.

Sienna's low-key display comes after she made a powerful speech at the Tribeca Film Festival's Time's Up event last week.

The event saw women from a variety of backgrounds - including

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