The actress was shooting scenes for the hit TV show in Central Park, in guise as on-screen persona Blair Waldorf.
Leighton was garnering admiring glances from onlookers in her citrusy Stella skirt, which she teamed with a yellow ruffled top, plus matching tangerine tote and Brian Atwood heels.
This might not be the only Gossip Girl Stella McCartney partnership we see in the near future - if the fashion whispers are to be believed, co-star Blake Lively has been lined up to be ambassador for the British brand across the pond...
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