Lil Nas X kept the bubbles below the belt in a steamy pic, showing off his ripped body ... and gal pals Tana Mongeau and Ashly Schwan were all smiles takin' a pic in the tub together.

Folks like Kali Uchis and Maluma also love to indulge themselves in the occasional sudsy bath ... but they ain't alone.

Coi Leray was lovin' every minute of her bubble bath, donning a pair of shades and showing off her tattoos while in the tub.

Lele Pons left little to the imagination, holding a red rose in the bath while surrounded by petals.