Former First Lady, Michelle Obama, shared the sweetest message for royal baby number three.

“Barack and I are thrilled to congratulate The Duke and Duchess of Cambridge on their newest arrival!” she wrote in an Instagram post. “We hope to meet him soon for a Kensington Palace pajama party. I’ll wear my robe!”

The PJ party in reference to the time she and Barack met Prince George at the castle, who wore his fanciest bathrobe for the occasion.

Barack and I are thrilled to congratulate The Duke and Duchess of Cambridge on their newest arrival! We hope to meet him soon for a Kensington Palace pajama party. I’ll wear my robe!

A post shared by Michelle Obama (@michelleobama) on Apr 23, 2018 at 2:19pm PDT