Michael Bublé has melted hearts by sharing the most romantic picture with his wife Luisana Lopilato.In honour of her 34th birthday on Tuesday, the Canadian singer paid tribute to his love and described her as his "best friend, my inspiration, my fiercest supporter".READ: Michael Buble's wife Luisana thanks fans after being forced to defend her marriageWATCH: Michael Buble's daughter Vida steals the show in cute video"Happy Birthday to my best friend, my inspiration, my fiercest supporter, my