The actress took to a mini-stage inside the park to address the dance-loving crowds, keeping it casual in flared jeans, a bright red top, staple sunnies and a straw trilby.
Katie has long been a pioneer of dancing, having co-founded the Dizzy Feet foundation with So You Think You Can Dance judge Nigel Lythcoe back in 2009.
The charity aims to increase access to dance education in the US and help aspiring dancers reach their professional potential.
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