Britney Spears premiered her video for 'I Wanna Go' late last night, and the results are quite different from her previous 'Femme Fatale' videos for 'Hold It Against Me' and 'Till the World Ends.' In 'I Wanna Go,' Brit ditches the dancers and intensity to create a funny clip co-starring 'Half Baked' actor Guillermo Diaz.

"Shame on me / to need release," Spears sings in the 'I Wanna Go' bridge, and she lets loose big time in this hilarious video. In the beginning, Ms. Brit attends a press conference -- looking sexy in a cropped T-shirt, leather jacket, skin-tight jeans and studded black high heels -- where reporters ask her a series of ridiculous questions before she flips out 'Half Baked' style.

After being asked if it was true that she really hated puppies, Brit unleashes a series of "Eff you's" at reporters, a la Scarface in the 1998 stoner comedy. Guillermo Diaz, who originated the amazing fast food freakout, even makes several cameos in the video, pouring milk all over himself in one scene, making us laugh and scratch our heads all at the same time.

In addition to this, Brit also mocks her 2002 failed dramatic flick 'Crossroads' with a movie theater sign reading 'Crossroads 2: Cross Harder.' She also gropes a fan, flashes her goods, hooks up with a cop, and beats the living crap out of the paparazzi before realizing they are 'Terminator'-esque robots. At the end of the video, Brit pays tribute to Michael Jackson's 'Thriller,' as Diaz, unbeknownst to Brit, exposes his true identity when he turns around and flashes his red eyes for the viewers.

We are digging this new side of Spears! It's so great to see her truly having fun again. Not to mention that her abs look absolutely incredible! Keep it up, Brit!

Watch the Britney Spears 'I Wanna Go' Video