"Today is James 1st Birthday everyone!!" the mother of two captioned the photograph above, featuring her daughter Leah playing with her birthday baby brother. "I'm such a proud mommy and love seeing my babies together! So amazing! Sending so much love to everyone! I'm just super happy lol."
Amber also shared a sweet snap of her boy enjoying some well-deserved cake and added, "My heart ugh!!"
Wish James a happy (belated) birthday in the comments -- and relive his first MTV moment in the tender throwback clip below.