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This is HILARIOUS -- we love with seemingly unrelated celebs comment on another celeb's Instagram and that's just what happened with John Mayer's shading of Justin Bieber's intimate selfie of himself kissing fiancee Hailey Baldwin in a pool the other day.

The emo-singer wrote: "Interesting dynamic with the photographer in the hot tub. That’s gotta feel super third wheel.” Funny, that's exactly what we were thinking!!!

He went on to say, "I see a lot of myself in this hot tub photographer. Imagine being in a hot tub on business."

Love it!

Speaking of social media, it was only the other day that Justin started following Hailey on Instagram, which is kinda funny. Guess he didn't see fit to click that button before he proposed. And now that the two are affianced, Justin and Hailey are being very open with their personal Instagram posts ... JB posted this shot of the couple's matching bling the other day (whoa!) and Hailey posted a shot of the couple getting on a private jet in New York.

She just got a lifestyle upgrade!