Can you believe it's the 20th anniversary of the High Line? 20 years since the first section of New York's beloved elevated park opened to the public - originally spanning from Gansevoort Street to 20th Street. In the years since, the High Line has stretched to become a 1.45-mile-long greenway featuring over 500 species of plants and trees.

This week, the High Line kicked off its milestone year with a gorgeous soiree honoring the Diller - von Furstenberg Family Foundation and the transformative impact they've had on the evolution of the iconic outdoor space. Guests enjoyed cocktails on the newest section of the park which opens June 5th. Dinner followed at Union West with stations inspired by all of the different natural details of the High Line.

Over $3.3 million was raised from the evening, with all proceeds from the benefit support the High Line’s programs, operations and maintenance. Click through for an inside look at the evening, and the stars who showed up to lend their

[Photos by Jared Siskin/Patrick McMullan via Getty Images]