Girl group Girls' Generation's member Tiffany revealed her unchanging friendship with Wonder Girls' members Yeeun and Sunmi.

"Yenny & Mimi," posted Tiffany on her Instagram on Sunday along with two pictures.

In the pictures, Tiffany is posing for a self-taken photo with Yeeun and Sunmi, respectively. The two groups debuted in the same year, becoming friends in the same field.

Girls' Generation is currently actively promoting their fifth album Lion Heart and Wonder Girls their third album REBOOT.