Katy Perry's 'Last Friday Night (T.G.I.F.)' is all about the cameos

Check out the folks Katy has appearing in this thing:

• Rebecca Black (legally required to appear in all videos with Friday in the title)
• Darren Criss & Kevin McHale (Blaine & Artie from Glee)
• All 3 Hanson brothers
• 80's sexpot Debbie Gibson
• 80s saxpot Kenny G

and

• Corey freakin' Feldman!