You Have to See Kim Kardashian's Tribute for North West's Birthday

Happy birthday, North West! Kim and Kanye's oldest child turns 5 years old today, and naturally, her famous mom took to Instagram to share a tribute to the well-dressed kid. Kardashian West posted a cute photo of her and North, along with Kourtney's daughter, Penelope, and it just might make your heart melt.

"My baby girl turns 5 today," Kardashian West captioned her new Instagram. "Never did I think back then that I would have my best friend for life! I'm so honored to be your mom Northie! You have brought more joy into my world than I ever could have imagined."

Scroll down to read her letter in full, and revisit their cutest mother-daughter moments.