KATHY BETH TERRY VIDEO PREMIERE: That’s a braces-clad Katy Perry, who goes for a record-breaking five straight #1 singles with “Last Friday Night (T.G.I.F.),” the new video from her platinum-plus Teenage Dream album, which debuted on VEVO over the weekend. Look for cameos in the clip from Kenny G, Hanson, Glee's Darren Criss and Kevin McHale, Corey Feldman, Debbie Gibson and “Fridays” gal Rebecca Black herself in a John Hughes/Brady Bunch/Hangover-inspired clip. (6/13p)