Solange Knowles Wishes Niece Blue Ivy Happy Birthday, Calls Her "My Twin" and "Sassy Pants": Photo

She sure is loved! Solange Knowles wished her niece Blue Ivy a happy 3rd birthday in a sweet Instagram post on Wednesday, Jan. 7.

The DJ, who married video director Alan Ferguson in November, also posted a cute photo with her little pal. She tightly held onto Beyonce and Jay Z's daughter as they played with makeup.

"My twin, my fellow sassy pants, my dancing partner, my incredibly smart, beautiful, niece-y-poo, turns 3 today!" Knowles, 28, captioned. "I love her so much."

Earlier in the day, Beyonce posted a photo of Blue's Frozen-inspired birthday cake. "[Blue is] addicted to Frozen," an insider previously told Us Weekly. She "watches it several times a day" and "cries when pulled away."