The world’s greatest grandparents award has to go to Goldie Hawn and Kurt Russell.

To celebrate Rani Rose’s fourth birthday, the duo dressed up as king and queen, while she wore a princess outfit.

Rani Rose is the youngest child of Kate Hudson, Goldie Hawn’s daughter.

While Kurt Russell is not her father, Hudson has always considered him to be her dad, given that she has no relationship with her biological father.

Both Hudson and Hawn posted the sweetest pictures of the birthday celebrations, prompting Instagram to send them their best wishes.

Sharon Stone felt Hawn and Russell were the best, while Maria Shriver also loved the idea.

Instagram users have declared Hawn and Russell are the sweetest grandparents ever to be such cool sports.

Hudson also added more pictures of Rani Rose, from a baby to now, playing the doting momma.

Now that Rani Rose is four, Hudson might just get baby fever again, given that she has once stated she wanted more kids.