Eminem, Macklemore & Ryan Lewis, and Taylor Swift were among the winners Sunday night at the first-ever YouTube Music Awards, held at Pier 36 in New York City.

Em was named artist of the year, based on the total number of views, likes, shares, comments and subscribers he's received on YouTube in the past year. He was also on hand to close the show with a performance of his new song, "Rap God."

Macklemore & Ryan Lewis received the award for YouTube Breakthrough, as the act with the highest growth in views and subscribers over the past year.

Taylor picked up the YouTube Phenomenon prize for inspiring the biggest number of fan responses.

The Video of the Year category was stacked with pop stars like Lady Gaga, Justin Bieber, Miley Cyrus,One Direction, PSY, and Macklemore & Ryan Lewis, but they all lost to the South Korean group Girls' Generation and their "I Got a Boy" clip.

Though she wasn't a winner, Gaga still made her mark on the ceremony by performing one of her newARTPOP tracks, "Dope," live for the first time. In fact, she arrived on the red carpet with the same unusual look — complete with grills — that's seen in her recently-revealed artwork for "Dope."

Avicii; alternative rockers Arcade Fire; rappers M.I.A., Earl Sweatshirt and Tyler the Creator; and the band Walk Off the Earth were also on the bill.

Actor Jason Schwartzman and comedian/musician Reggie Watts hosted the YouTube Music Awards, which was streamed live on YouTube. (T-PAIN, STIRLING AND ZONDAG AUDIO IS ABC 1-ON-1)

Here are the winners:

Video of the Year 
Girls' Generation — "I Got a Boy"

Artist of the Year
Eminem

Response of the Year
Lindsey Stirling and Pentatonix — "Radioactive"

YouTube Phenomenon
Taylor Swift — "I Knew You Were Trouble"

YouTube Breakthrough
Macklemore & Ryan Lewis

Innovation of the Year
DeStorm — "See Me Standing"