Michael Bublé: crooner of mothers and sharer of photos of random women's arses. All round charmer, no?

Bublé posted this photo to his Instagram on Monday while in Miami, the star not being him but an unidentified woman unknowingly having her photo taken in the background.

The above photo came with the caption:

There was something about this photo lu took ,that seemed worthy of instagram. #myhumps #babygotback #hungryshorts #onlyinmiami#picoftheday #beautifulbum

As you can imagine, not everyone is too happy with the married father-of-one for posting the sneaky photo to his 1 million plus followers.

Now Bublé claims that "lu", that being his wife Luisana Lopilato, took the photo, but that hasn't appeased fans who've been commented under the photo and one Twitter in the thousands saying things such as the following.

We kind of agree mostly with the last point here.