Heidi Klum and Joan Collins Debate 'Who Has More Fun' — Blondes or Brunettes

"I've been having fun for a lot longer than you have," Collins joked to Klum in a video the pair filmed on the set of 'Germany's Next Top Model'

<p>Amy Sussman/Getty ; Karwai Tang/WireImage</p> Heidi Klum and Joan Collins

Amy Sussman/Getty ; Karwai Tang/WireImage

Heidi Klum and Joan Collins

Heidi Klum and Joan Collins are settling an age-old debate — do blondes have more fun than brunettes?

The supermodel, 50, and the Dynasty actress, 90, pondered the question together in a video posted on Klum's Instagram grid on Saturday.

"I know I say that blondes have more fun, but maybe brunettes have more fun?" the Germany's Next Top Model host asked the camera in the clip, before panning to reveal Collins seated next to her.

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"Well, Heidi, you look like you always have fun, but I've been having fun for a lot longer than you have," the Dynasty star answered with a laugh.

"I think we have a lot of fun. I think we both have a lot of fun," Collins continued.

"We all have a lot of fun — it doesn't matter what hair color," Klum concluded at the end of the video, and Collins agreed. So, the debate lives on!

Related: Heidi Klum Says Kylie Minogue 'Loved' Her New Cover of Corey Hart's 'Sunglasses at Night' (Exclusive)

Per Klum's caption, the unlikely duo was on the set of her show GNTM, the modeling competition reality show she's hosted since its first season in 2006.

<p>Heidi Klum / Instagram</p> Joan Collins and Heidi Klum

Heidi Klum / Instagram

Joan Collins and Heidi Klum

"Blond or brunette! Who has more fun? @joancollinsdbe ❤️ GNTM," she wrote. Collins will likely appear on the upcoming season of the show as a guest judge.

No matter who has more fun, one thing is for sure — both women can serve a look.

Related: Joan Collins Pulls Off Her Signature Bold Lip at 90 (Yes, 90!) on Emmys Red Carpet — and We Are Obsessed

In the video, Klum wore what appeared to be a magenta top, adorned with a statement jewelry piece for added pop. Collins looked glamorous in a silvery white suit jacket embellished with paillettes.

Both women finished their looks with bold lip colors and wore their hair down, proudly showing off their bangs.

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