"Happy 4th Birthday my beautiful smart curious baby boy Psalm," raved the Kardashians star in her caption. "I'm just so happy you chose me to be your mommy. You teach me so much every day. I can't ...

The mom of four also included other photos of Lennon from throughout the year. "Happy 4th birthday our sweet little LeLo🥰💕 (a few days late)🎈" she wrote in her caption.

"Dear #PapaBear, Happy 4th birthday, buddy," she began. "You’ve made mama & daddy so happy. Since you were in mama’s tummy, you gave me a whole new meaning to life. Hope." Never miss a story ...

“Happy 4th Birthday my beautiful smart curious baby boy Psalm,” she captioned a carousel of pics from the party on Tuesday. “I’m just so happy you chose me to be your mommy.

He reportedly wished Archie, here in dad Harry’s arms, a happy 4th birthday “wherever he was.” Alexi Lubomirski / Duke and Duchess of Sussex ...