John Mayer has expressed amazement at fellow singer Justin Bieber's ease at getting intimate with Hailey Baldwin in the presence of other people.
The remark comes after Bieber posted a racy Instagram photo of him sharing a passionate kiss with his bikini-clad fiancée in a spa on Saturday night (NZ time).
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In the photo, the newly engaged couple are seen entangled in the tub - but the 'Your Body is Wonderland' singer has questioned how the photo was taken.
"Interesting dynamic with the photographer in the hot tub," he wrote.
"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."
The singer's manager Scooter Braun also commented on the third wheel aspect to the photo.
"Damnnnn... but who took this pic? The 3rd wheel is so real right now."
The couple confirmed their engagement last week via Bieber's Instagram, after rumours swirled that he'd popped the question while on holiday.
The post of the pair kissing has received over 8 million likes on Instagram.