YouTube's most viewed video of 2013

YouTube has released its top videos of the year, and the big winner is South Korean pop star Psy with his hit "Gentleman."

"Gentleman" was the most viewed video of the year on YouTube, with 598 million views.

Psy held the top spot last year, too, with his huge hit, "Gangnam Style." It is YouTube's most-watched video ever with 1.8 billion views.

Following behind him this year is Miley Cyrus, taking the No. 2 and 3 spots with "We Can't Stop" and "Wrecking Ball." Those hits had nearly 700 million views combined.

Katy Perry's "Roar" came in fourth with more than 200 million views.