Katy Perry may have the party anthem of the Summer in "Last Friday Night (T.G.I.F.)," her latest single from Teenage Dream. If the catchy tune doesn't make you happy, then the video will. In the '80s movie homage, she gets into character as Kathy Beth Terry, a glasses-and-braces-clad nerd who wakes up with the fuzzy memories of an epic party the night before. The real highlights of the clip are the star cameos, which include Glee stars Darren Criss and Kevin McHale and viral video sensation Rebecca Black. Those are only a few of the celebrity sightings though, so watch the video to catch the rest!
Ellen DeGeneres Grills Taylor Swift About Her Love Life
This Butt-Lifting Workout Is Better Than Spanx
10-Minute CrossFit Workout From Jessica Alba's Trainer!
This One Is For the Leggings: Inner and Outer Thigh Workout
HIMYM Exclusive: The Final Robin Sparkles Performance You Didn't Get to See!
A Healthy Halloween Treat That's to Die For!
9 Signs It's Time to Quit Tinder
Sam Rockwell on the Biggest Role He Ever Turned Down and His New Movie, Laggies
10 Times the Friends Cast Teamed Up on Screen
Bloody-Good Makeup: Transform Yourself Into a Fang Fatale
In Which We Celebrate the Humble Hot Dog
The McConaissance Continues — What's Matthew up to Now?
Is Bill Murray's New Movie, St. Vincent, Worth Watching?
23 Halloween Costumes That Should Never Be Sexy
Michael B. Jordan Talks Training For Fantastic Four: "This Is the Biggest I've Ever Been"
It's Tabata Time: Short but Intense Bodyweight Workout
Take a Look Back at Kim Kardashian's 33rd Year on Earth
Who's Made Barbara Walters's Most Fascinating List So Far?
Seriously Distracted Episode 1: "The Nightmare Client" — Guest-Starring OITNB's Kimiko Glenn!
Stop! You're Removing Your Eye Makeup All Wrong
DIY Ice Bucket Challenge & 3 Other Quirky Halloween Costume Ideas!
There's a Good Reason For Your Recurring Notebook Nostalgia