Article continues below advertisementPop stars supporting pop stars!Britney Spears jumped to fellow award-winning artist Justin Bieber's defense on social media after the "Sorry" singer was criticized for using his 1-year-old son, Jack Blues, in a photo promoting his new album Swag II.While celebrating his album's release on Friday, September 5, Justin shared several black-and-white photos to Instagram - including one of him holding his and wife Hailey Bieber's baby boy as the toddler's back faced the camera.