Kim Do Yeon performs the congratulatory song at her older sister's wedding with best friend Choi Yoo Jung!

This past June 10, former IOI member Kim Do Yeon's older sister held a wedding ceremony!

The older sister got to take advantage of having a soon-to-debut idol as a younger sister, since Kim Do Yeon set out to perform the congratulatory song herself, along with the help of her best friend Choi Yoo Jung!

According to online accounts, the two girls performed Psy's "I Luv It" during the wedding, then took photos with guests at the ceremony with bright smiles on their faces. Kim Do Yeon herself had even posted photos and video footage from the wedding on her Instagram after the event, but shortly after, set her account to private.�

Meanwhile, Choi Yoo Jung and Kim Do Yeon are currently preparing to debut in a new girl group under Fantagio, currently coined i-Teen Girls. The group will consist of 8 members, aiming to debut this July.�

Check out photos of Kim Do Yeon and Choi Yoo Jung at the wedding below!

SEE ALSO: "Following thorough discussions with the NewJeans members," Why ADOR's official statement regarding the latest feud with HYBE could backfire

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1. Choi Yoo Jung
2. Kim Do Yeon