It's time to write Katy Perry into the pop history books. The singer's hit song Last Friday Night (T.G.I.F.) has surpassed LMFAO's hit single Party Rock Anthem on Billboard's Hot 100 list, thus propelling the single into the no. 1 spot on the chart. With that, this marks five no. 1 singles from her album Teenage Dream, tying MJ in the record books.