YouTube Music Awards held in NY

Lady Gaga: there were 'giant craters' in my injured hip

In a message to young fans around the world, she said: "Harness your creativity, harness your invention, and know that you are valuable."

The event was one of many over several days that Gaga has staged in conjunction with the US launch of ARTPOP, which will be released on Monday after a delay owing to a hip injury.

Gaga has described ARTPOP as "a celebration and a poetic musical journey" marked by a "lack of maturity and responsibility." On Sunday night she noted "the album's a little chaotic," adding "there's a mathematics, a physics about it," which she saw as tying in nicely with her flying machine.

"It's not really about me at all ... This is not about money and mass production," she said. "It's about moving the world away from a place of vanity and ego."

Nonetheless, Gaga, named the top-earning musician under 30 by Forbes with an estimated take of $80 million last year, teamed up with Jeff Koons, often lauded by also criticized as the most brazenly commercial of contemporary artists.

Koons designed the cover art for the album, as well as various art installations connected to its release. They include several monumental sculptures, which were on display on Sunday. One of those graces the "ARTPOP" cover and depicts Gaga with a reflective blue ball between her legs.

ARTPOP's lead single, "Applause", was released on August 12 and made it to number four on the US Billboard Hot 100.

Related:

Lady Gaga is top earning celebrity under 30: Forbes

Lady Gaga to perform at MTV awards for first time since surgery

Li Yuchun wins 2013 MTV EMA Best Worldwide Act