7. "Last Friday Night (T.G.I.F.)" by Katy Perry
Who doesn't love to party on Friday nights? According to Katy Perry, her song "Last Friday Night (T.G.I.F)" was inspired after a night of wild partying. Who would forget the uber cute music video with cameo appearances of Darren Criss, Kevin McHale, Hanson and even Rebecca Black! No wonder this song reached #1 on the U. S Billboard Hot 100 and Canadian Hot 100.