Girls' Generation have�dropped their 4th full-length album 'I Got a Boy'.

Since its release on January 1st, the girls have been�dominating charts,�and the music video for the title track is continuing to rake in�millions of views.

For this episode of KBS' 'Music Bank', they're switching out their usual coupling song, "Dancing Queen", with a special performance. Taeyeon and Tiffany performed their duet, "Lost in Love", from the recent album for the first time on the show.

Check out the "Lost in Love" and "I Got a Boy" performances below!