Katy Perry's video for 'Last Friday Night (T.G.I.F.)' celebrates all that is the '80s, with cameos by superstars like Corey Feldman and Debbie Gibson. She also pulls in modern web celeb Rebecca Black by virtue of the fact that Rebecca's viral hit 'Friday' shares its favorite day of the week with Perry's now No. 1 radio smash. The clip was a pop culture free-for-all and the singer has released the behind-the-scenes footage from the set.

Perry rarely breaks character as Kathy Beth Terry, the geek with the huge glasses and obtrusive retainer who is transformed into a big-haired, contact lens-wearing popular chick. Perry calls her character "a loner with dental problems" and explains why it was imperative to have Black appear in the video. "We both love Fridays so that's why I asked her to be in this music video," Perry-as-Terry said. "It's her favorite day of the week and my favorite day of the week."

Other stars of the video switch back and forth between themselves and their characters, so you'll have to pay close attention and follow along. Members of the 'Glee' cast are also present. Kevin McHale (Everett McDonald in the video) talks about the" heinous '80s clothes" he must wear, while Darren Criss (Aaron Christopherson in the video) offers up details of the "rager" party where the video's action takes place. McHale-as-McDonald says that some people look at a person's bone structure, whereas he looks at "wire structure" of a girl's head gear when determining her mate-ability.

Feldman and Gibson, who play Kathy Beth Terry's parents, also appear, praising their brainy little girl and expressing shock that she has actual friends, while Uncle Kenny AKA Kenny G, elaborates about how he had to play his sax in the video.

Criss has the best quote of the entire clip, saying, "I met Kenny G. That's a bucket list check off!" True dat, Darren!

Watch the Behind-the-Scenes Footage of Katy Perry 'Last Friday Night (T.G.I.F.)' Video