John Mayer has mocked Justin Bieber after he posted a steamy photograph on his Instagram account.

The 40-year-old musician has poked fun at the Canadian star, who recently posted a snap of himself and his wife-to-be Hailey Baldwin sharing a passionate kiss while sat in a hot tub.

Beneath the eye-catching photo, John wrote: ''Interesting dynamic with the photographer in the hot tub. That's gotta feel super third wheel. I see a lot of myself in this hot tub photographer. Imagine being in a hot tub on business (sic)''

Justin, 24, and Hailey, 21, announced their engagement earlier this month, and the 'Sorry' hitmaker subsequently spoke about the decision on his Instagram account.

Alongside a snap of the duo sharing an intimate embrace, Justin - who previously dated Selena Gomez - wrote: ''Was gonna wait a while to say anything but word travels fast, listen plain and simple Hailey I am soooo in love with everything about you! So committed to spending my life getting to know every single part of you loving you patiently and kindLY. I promise to lead our family with honor and integrity letting Jesus through his Holy Spirit guide us in everything we do and every decision we make. My heart is COMPLETELY and FULLY YOURS and I will ALWAYS put you first! You are the love of my life Hailey Baldwin and I wouldn't want to spend it with anybody else. You make me so much better and we compliment eachother so well!! Can't wait for the best season of life yet!. It's funny because now with you everything seems to make sense! The thing I am most excited for is that my little brother and sister get to see another healthy stable marriage and look for the same!!! (sic)''