last friday night (t.g.i.f)

*This post was originally published on June 30. It is being republished with updated material. UPDATE: "Last Friday Night" maintains #2 rank on the Hot 100. KATY PERRY will have to wait until next week to try and tie MICHAEL JACKSON for a prestigious chart honor. "Last Friday Night (T.G.I.F.)" was expected to hit number one on the Hot 100 this week, which would have given Perr