The girls beat out other acts such as Justin Bieber, One Direction, Psy, Miley Cyrus, Lady Gaga, Selena Gomez, and other big names to win the biggest prize of the year. The winner was determined by fan shares of special nominee clips made by YouTube. And of course, the ever-so-lovely Tiffany was there to receive the award for the entire group!

SEE ALSO: Tiffany to represent Girls' Generation at the 'YouTube Music Awards'!

Congratulations to Girls' Generation!