Gong Hyo Jin has turned 40 years old!

The actress was born on April 4, 1980, which means she has officially turned 40 (in Korean age). 

On this special day, Gong Hyo Jin shared photos and video of her celebrating with a few of her peers. Sitting next to the cake and a flower bouquet, the actress flashes her adorable smile as they sing happy birthday. 

Meanwhile, netizens are expressing amazement at her youthful looks, commenting, "Can't believe she's 40," "She looks so young."

Happy Birthday, Gong Hyo Jin!