Adele's "Hello" is one of the biggest songs of the year and hands down had the most explosive video debut. However, we all know that no matter how amazing something is, nothing lasts forever; her 25 lead single got knocked off the No. 1 spot on the Billboard Hot 100 by Justin Bieber's Purpose smash hit "Sorry." Biebs was humble about it and took to Instagram to share his disbelief, saying: "D*mn, never would I have thought this." Congrats again, Justin.
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