We're only a few months into the year so far, but it's already become clear that stars are not waiting until summer to heat up our Instagram feeds. Celebrities like Lizzo [1], Jennifer Lopez [2], Bella Hadid, and Jordyn Woods have taken to social media to flaunt their sexy swimsuits, while Harry Shum Jr., Bad Bunny, Maluma, and Lil Nas X all ditched their shirts to show us what they've been hiding underneath. If this is any indication of what's to come, we're in for a sizzling hot year. Feast your eyes on the sexiest celebrity selfies of 2021 ahead. But first, you might want to pour yourself a glass of cold water because you're going to need it — trust us.