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Bieber, the voice of reason. #CommentsByCelebs

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Shawn Mendes is creeping into Justin Bieber's comments! Bieber posted some pix of his beautiful wife Hailey Baldwin on Thursday and Hailey's ex Shawn Mendes is liking them! On Bieber's account!

Bieber had to respond to defend his marriage, writing "their friends relax." Beyond the incorrect spelling of "they're," and the missing comma, it's cute that JB is cool with his wife's ex commenting on his Instagram. Frankly, Justin's got enough other stuff to worry about right now ... this is the least of his problems!

Poor Bieber has been battling depression, but reports say wife Hailey has been close by his side for the whole process. Justin's smart not to cause trouble with his wife -- she's the biggest fan he has!