The supermodel turned 35 on Monday, as did her twin sister, Pati. So, to mark the joyful occasion, so she posted an adorable collage of the two of them on Instagram.
And it looks like the fraternal twins have been inseparable ever since they were kids. "Happy birthday super Pati!!!" Gisele wrote. "I wish you the most amazing things in this world. Thank you for being always there for me, since the very beginning. I love you so much."
PICS: Stars You Didn't Know Were Related
Gisele also added the hashtags "guardian angel" and "best friend in the world" to describe her sister.
But when it comes to siblings, it doesn't just stop with Gisele and Pati. The twins have four other sisters in their family: Raquel, Graziela, Gabriela and Rafaela.
WATCH: Gisele Shares Her First Runway Pic
Gisele and Pati aren't the only ones who have us seeing double! Check out the video below to see more from the VH1 reality show, Twinning. But warning, there's lots of drama!