MONTCLAIR, California -- Big [artist id="1133"]Snoop D-O-Double-G[/artist] celebrates his 40th birthday Thursday (October 20), but on Wednesday night, he was all business.

Well, business as usual. Snoop spent the evening shooting a music video with [artist id="2427571"]Wiz Khalifa[/artist] for the track "Young, Wild & Free." It's the first song from the soundtrack of the duo's upcoming stoner comedy, [article id="1655453"]"Mac & Devin Go to High School."[/article]

It was quite a spectacle on the video set. The mellow MCs took over a drive-in movie theater an hour outside Los Angeles with tons of tricked-out rides and a variety of video vixens. The clip was directed by Dylan Brown, who also handled directing duties on the film.

"This is a family affair, man," Wiz told MTV News. "Everybody that you see was all involved with the project. We all got love for each other, and you know, we just keeping it moving, right?"

"Yeah that's all," Snoop added. "We just having fun. We at a big drive-in theater so we could have as many people and have as many things happen as possible in the celebration of being young, wild, and free -- having a good time."

And clearly they were having a good time. One scene saw Snoop and Wiz romping around the parking lot in some souped-up off-road karts, loaded with a crew of cuties.

"That's definitely going along with the theme of being young, wild, and free -- just having fun, wild'n out," Wiz said. "The whole theme of the video, we just getting it crackin' in the parking lot, man, just turning this thing out. So we had a couple little of our friends in the car, and we drove fast."

"I had to level out the playing field," Snoop admitted, with his kart holding a few extra girls than Wiz's. "I had to have some, ahem, weight issues, so I had to have some girls roll with me to level out my car."

If you're wondering how this whole scene ties into the high school flick, the Doggfather has you covered.

"We got some more party scenes where we just gonna be doing our verses and having the scenes from the movie play on the big screen from the actual movie 'Mac & Devin Go to High School,' " Snoop said. "So people get a chance to see a few scenes and see us perform at the same time."

The song itself got production help from Bruno Mars and quickly came together.

"[Bruno Mars] sent me the music and I played the music for Wiz and he loved it and we came together," Snoop said. "That's what we do: We make good music. If you've got a great idea, which was started by Bruno, and me and Wiz, we take it to the next level, gave it back to Bruno. He tightened up the edges, and now it's a complete situation."

Look for the soundtrack in December, just in time for the holiday season, followed by the film's release in February.