A photograph of popular South Korean girl group SNSD (Girls' Generation) member Yuri getting ready for a performance has left netizens and fans amazed by how toned her abs have become.

Yuri first wowed netizens with her body in a commercial for theme park Carribean Bay where she acted as a lifeguard-in-training.

Netizens remarked that her abs seemed to have gotten more and more defined over time.

She was recently seen dancing in a revealing dress with SHINee member Minho on TV.

Known for having an excellent body, Yuri is often seen dancing in crop tops, which expose her toned midriff section.

Her abs have long been the source of envy for many fans and netizens.

Korean entertainment portal All Kpop reported that Yuri followed a strict diet and a rigorous exercise regimen.

According to All Kpop, she does 600 sit-ups a day in addition to her dance exercises, and consumes a consistent daily diet of seasonal vegetables, brown rice, five heads of broccoli, and chicken breast.

Click on thumbnail to view (Photos: Internet, SM Town)

Appearing as guest at the Christmas TV edition of You Hee-Yeol's Sketchbook, Gain delivered her hit duet, The Gaze, with Yoon Jong-Shin.

Clad in a short bareback dress, she caught the audience by surprise with a pole dance performance before she started singing.

Although performing a duet, there was no interaction between Gain and Yoon, who were seated at a corner. Instead, the 25-year-old songstress walked over to seduce the host, who was playing the piano.

You Hee-Yeol's Sketchbook, debuted in 2009, is a music programme that sees the host chit-chatting with his guests, who also perform with a live band. It is airs on KBS 2TV after midnight every Friday.

Click on thumbnail to view (Photos: Internet screengrabs)