Kendall Jenner: Sky's the Limit When I'm Hosting ... Just Ask Floyd, Kim & Calvin

Kendall Jenner got sky-high with a bunch of celebs and athletes ... 1,000 ft above downtown Los Angeles.

Kendall hosted a party Thursday night at OUE Skyspace, the new observation deck atop the U.S. Bank Tower. Sister Kim showed up as well as Floyd Mayweather, Usher, Calvin Harris, Jaden Smith, Russell Westbrook, AnnaLynne McCord, Von Miller and Chuck Liddell.

Travis Scott performed, and everyone got a chance to try the outdoor Skyslide between the 69th and 70th floors ... including Kendall. Wheeeeeeeeeeee!!!!