Last night at the Hard Rock Cafe in Times Square, the Wonder Girls appeared as surprise guests.

Ty Bentli brought the Wonder Girls to his birthday bash to help celebrate at the Hard Rock Cafe in Times Square.

For the fans that missed the Wonder Girls from the iHeartRadio performance last month, this was another chance to see the girls up close.

The show started with Ty introducing himself and thanking everyone for coming out. They even played Psy's "Gangnam Style" and danced to the 'horse-riding' dance.

The Wonder Girls then made their entrance and introduced themselves as well.

The Wonder Girls sang many of their hit songs such as "So Hot", "Tell Me", "Nobody" and "Be My Baby." They sang a total of 11 songs.

Overall, they had a great time interacting with their fans and were honored to be special guests for Ty's birthday.

Wonder Girls began promoting in the U.S. in 2009 as they toured with the Jonas Brothers. They were the first South Korean group to make it on the U.S. Billboard 'Hot 100' chart at number 76 with their song, "Nobody."

The Wonder Girls also have albums out in China and Japan, making them a global sensation.