Pink threw her daughter an adorable 'big sister party' to celebrate the birth of her son

It's not always an easy adjustment to bring a new baby into the family — especially if your firstborn has been an only child for quite a while.

But after the birth of her son, Jameson, Pink came up with a totally adorable yet genius plan to make sure her 5-year-old daughter, Willow, didn't feel even slightly left out...

The singer threw Willow a 'Big Sister' party.

Pink shared a sweet snap from the party of herself with her two children, and in it, Willow looks totally proud and beams from ear to ear as she holds her cake.

If this isn't a total mum win, we honestly don't know what is!