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left fans swooning over her heartfelt family post shared to Instagram on Sunday, which pictured her and husband

The 25-year-old model posted a series of heartwarming snaps alongside Justin as they played with her sister Alaia Baldwin’s daughter. Looking like the ultimate It-girl in camel cargos, a y2k spaghetti strap top and ditsy butterfly clip in pink gingham, Hailey rocked the chicest laidback model aesthetic to tend to her aunty duties.

One photo showed Hailey holding Iris on her hip as the two-year-old beamed at her aunty with chocolate on her face, as she wrote: “there’s a little princess who had a birthday party today.”

Another sweet snap showed Hailey and Justin holding Iris up in the air, before a final photo that showed the model treating her niece to a mouthful of cake. So cute