PASADENA, CALIFORNIA - MAY 01: Alaina Meyer and Johnny Galecki attend series finale party for CBS' "The Big Bang Theory" at The Langham Huntington, Pasadena on May 01, 2019 in Pasadena, California. (Photo by Presley Ann/FilmMagic)

The Big Bang Theory actor Johnny Galecki and his girlfriend Alaina Meyer are expecting a son. This made the couple known through a photo on Instagram .

The 44-year-old actor and his 21-year-old girlfriend announced in early May that they are expecting a child. During a so-called ‘gender reveal party’, a party that is especially popular in America, where prospective parents announce the gender of kun baby, they let the couple know that they have a son.

On the Instagram page of both Galecki and Meyer, photos of the party are posted. You can see how the two have smeared each other with blue paint. The actor writes with the photo that it was a day to remember.

View this post on Instagram

A day I’ll never forget. ❤️❤️❤️ @alainamariemeyer

A post shared by Johnny Galecki (@sanctionedjohnnygalecki) on

In an interview with The Talk , Galecki recently said that he hoped that his first child would be a girl.

Galecki recently said goodbye to The B ig Bang Theory with his colleagues The series came to an end in May after twelve seasons.