By Michelle Guerrere
Updated Apr 23, 2016 @ 1:30 pm
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instagram / gigihadid

There are few birthdays as memorable as your 21st (at least in the States), and Gigi Hadid kicked off her birthday weekend in style with a fun family lunch yesterday. The model took to social media to share snaps from the party, including a few group photos with younger siblings Bella and Anwar and older sisters Marielle and Alana. "Birthday week begins!" Hadid wrote in the first 'gram as she showed off her rock-hard abs in a casual grey sweatshirt. Her second group shot was sillier, showing the girls laughing with Anwar kneeling on the ground near them, simply captioned: "More like it."

The down-to-earth celebration included bright teal balloons and a berry-topped cake (and yes, they did sing "Happy Birthday!"). If this was just the starter party, we can't wait to see what boyfriend Zayn Malik has in store for Hadid tonight.