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Britney Spears, Iggy Azalea

AKM-GSI

It's seriously becoming #ThrowbackThursday.

Britney Spears and Iggy Azalea have begun shooting an '80s-themed music video for their collaboration, "Pretty Girls," and it's certainly going to bring you back in time to when hair was crimped and everything was leopard-printed. An eyewitness tells E! News that they're filming in Studio City, Calif., and driving up and down the boulevard in a jeep.

"They were having a really good time and seem to get along really well," the source tells us.

Iggy was spotted holding a pink hairdryer, which will be used as a prop in the video, but based on the Instagram photos from both pop stars that's the least '80s-looking item! The "Booty" rapper posted a sideways selfie debuting some seriously crimped hair and wearing bright pink lipstick. She simply captioned the pic, "#PrettyGirls."

Britney, on the other hand, posted a pic of herself behind the wheel of the jeep, and her ensemble is certainly something to behold!

Britney Spears, Iggy Azalea, Music Video, Instagram

Instagram

Clad in a leopard-printed crop top and oversized earrings, the "I Wanna Go" singer looks incredible with big hair, sunglasses and an even bigger grin! No wonder the eyewitness tells us, "Britney looks like she was really enjoying herself, she looks happy."

She captioned her pic, "Girls roll up, windows roll down, eyes on us, jaws on the ground," which could allude to a line from the song.

Iggy, on the other hand, is donning even more denim than Spears, matching a blue jean vest with denim shorts! The pictures alone are making us anxious to not only see the video but also hear the song. It was originally supposed to be released in early 2015, but the two singers have kept us waiting.

Britney Spears, Iggy Azalea, Music Video, Instagram

Instagram

When Spears was asked recently when it would be released, she dished, "You'll have to wait and see. It's really exciting, though. It's very cool, I'll say that...I saw [Iggy's] song on TV and I was like a kid in a candy store. I was like, 'I love Iggy!' I was like, 'I love that video. I wanna work with her.' And it was really weird, because a week after that her manager was like, 'She's a huge fan of yours.' I was like, 'Let's do something together,' so it worked out."

—Additional reporting by Michelle Falls