f(x) member Sulli posted a self-cam picture to celebrate their first place spot on music charts.

Today she posted on her me2day, "Our song has won first place! I am so happy! Thanks everyone!" along with a photo.

In the photo, she has a marilyn monroe-style hairstyle and is wearing a casual outfit.

Internet users commented, "I like the song more and more" and "She is so pretty."

f(x) recently released their new song, "Rum Pum Pum Pum" on July 29 and won first place on music charts.