Blue Ivy Carter — the world's coolest toddler [1] — turned 3 years old this week, and her aunt, singer and DJ Solange Knowles, showed love to the little one with a sweet snap posted to her Instagram on Wednesday. The photo shows Blue helping Solange put on eye shadow [2] with the caption, "My twin, my fellow sassy pants, my dancing partner, my incredibly smart, beautiful, niece-y-poo, turns 3 today! I love her so much." That same day, Beyoncé shared pictures from Blue's birthday party; a black and white snap showed a giant "3" balloon next to an ice sculpture that read "Happy Birthday Blue" (do you think it was a Frozen-themed bash?) and other showed Blue enjoying a slice of rainbow cake. Keep reading to see the photos, then be sure to check out more of Blue's best snaps over the years [3].