Popular girl group Girls' Generation is finally making a comeback on January 1, 2013.

Ahead of their comeback SM Entertainment released Seohyun's teaser photo following Hyoyeon's yesterday. The new two teaser photos of Seohyun were uploaded on their official website.

Their new song "Dancing Queen" features the group's own version and style of Duffy's "Mercy." They have also filmed the music video and recording back in 2008.

For their new album, they have decided on a time machine concept that will prove to be a delight for fans.

In addition to the photos, Taeyeon's comeback message was shared on Naver.

Watch Taeyeon's comeback message below.