Chrissy Teigen had to explain why her bathwater looked dirty as hell after John Legend posted a video of her washing up … and the explanation had already been spoken.

Here’s the deal … John recently posted a video of Chrissy sitting naked in a bathtub, using one of his skincare products to scrub off body makeup … something she explicitly said in the clip from the get-go — and yet, there was still some confusion/mockery over this.

Trolls quickly flooded the comments on John’s Instagram post, saying the brownish bath water looked “dirty” … and accusing Chrissy of not showering enough, etc.

Clearly, the haters missed the part of the video where Chrissy says what exactly she’s scrubbing here … because she’s now in the comments offering up the same explanation.

Chrissy says …. “the water is dirty because I’m getting my body makeup off, like I said in the video my sweet angels!” Pretty patient response.

In addition to her comment section clarification, Chrissy clapped back at an account that tagged her in a post saying the “tub is for soaking not bathing.”