And Now, Here's What the Hadid Sisters Wore to Bella's Birthday Party

Yesterday Bella Hadid celebrated one of the biggest events in her life: her 21st birthday. And just like anyone for such a momentous occasion, dressing to impress is of utmost importance, and that's what the It model did. Naturally, her equally stylish sister, Gigi, was on hand for the festivities, and together, they expertly displayed how cool girls dress for a birthday party.

The sisters chose looks that perfectly complemented each other: a fitted little black dress for Bella (always a solid birthday party choice) that laced up the sides and a sky blue bustier and trousers with a matching blazer and heels for Gigi. Both outfits were festive enough for a special occasion, and they're perfect for your next big birthday celebration or any event in which cocktail attire is in order.

See Gigi and Bella's birthday party looks below.