Former 'Superman Returns' star twins Seo Eon and Seo Jun have turned seven years old!

On March 15 KST, their mother Moon Jung Won took to her personal Instagram account to share images of not only the boys' small 7th birthday celebration but also of the cake that the production team of 'Superman Returns' gifted them.

In the caption, Moon Jung Won explains that their birthday was celebrated quietly this year, but they were able to celebrate it with the cake that their 'Superman Returns' production friends brought to their home, calling the day "a birthday that we are even more grateful for."

Among the media in the post are a photo of the twins with the cake, a video of them blowing out the candles, a photo of cards the 'Superman Returns' production team wrote for the boys, photos of the boys enjoying a second birthday cake, and another photo of a third birthday cake.

Meanwhile, Moon Jung Won, husband and TV personality Lee Hwi Jae, and their twin sons were on 'Superman Returns' from 2013 - 2018.

Check out the Instagram post below!