Kelsea Ballerini is known for jumping into relationships “Heartfirst” … but you’ve gotta check out these shots where she leads with her hot bod instead!

The country singer turns 33 today … and we’ve put together some of her hottest shots to celebrate this steamy songstress.

While Kelsea may have grown up in landlocked Tennessee … she’s apparently no stranger to a bathing suit — drawing eyes in these skimpy red and white ‘fits.

Of course — while we’re sure she’s got great jeans — she doesn’t leave her fitness up to chance … hitting the gym and giving fans a look at her chest in a snap afterward.