“Thank you for being born so that I could be born that was very sweet of u,” Bella wrote on Instagram April 23. “Thank you for being the best sister, mom, daughter, human bean ever. You teach me something new everyday and sometimes I just smile because I feel so lucky to be your baby sister.”
She added, “I’m sitting next to you right now so don’t make it weird when you read this. I love you.”
Along with the heartwarming message, Bella, 25, included a carousel of photos of the tight-knit sisters, including several snaps from when they were kids and others at various modeling jobs as adults.