Michael Buble hits a sour note with Instagram pic

Michael Buble is known for singing sweet love songs but he may have hit a sour note when he posted a picture of an oblivious woman's butt to his official Instagram page.
The singer's wife seemingly took the picture while the pair were in Miami.  It showcases a lady wearing very tiny black shorts with her bottom hanging out.  Buble captioned the snap, "There was something about this photo Lu took that seemed worthy of Instagram." With a slew of hashtags like "#myhumps #babygotback #hungryshorts  #beautifulbum."