Heidi Klum calls her 18-year friendship with Tim Gunn the' longest marriage I've ever been in.'

Heidi Klum is upset that she and Tim Gunn are like a married couple while attending Tuesday's TODAY with Hoda and Jenna.

Teamwork makes dreams come true, and for Heidi Klum and Tim Gunn, they make the best "power couple" in fashion.

During an appearance on Tuesday on TODAY with Hoda and Jenna, the 49-year-old supermodel and TV personality opened up about the fact that Gunn is practically her husband now. The pair have collaborated on projects since their days on the fashion racing show Project Runway, which made its television debut in 2004.

"I've always said we were the longest marriage I've ever had," he said, smiling at Gunn and taking his hand.

"For me too," Gunn agreed, adding the Emmy winner, "and have been for 18 years." When asked by Jenna Bush Hager what made their relationship so good, Klum went back to Gunn and joked. He said: "Maybe it's because I only understand every third word you say. He gives me all those amazing words like "fun" and I don't know. You have this dictionary of [words]."

"These are my long years as a teacher," the 68-year-old replied. Gunn worked at Parsons School of Design from 1982 to 2007.

"But, Jenna, I think the fact that we're so different in so many ways and so similar in so many ways is part of what binds us.

"And we love what we do," added the supermodel, to which Gunn agreed. Klum and Gunn are currently promoting the third season of their latest fashion show Making the Cut, and fashionistas should be excited because this sounds like their best season yet.

"I'd say it's the best design we've ever had," Klum told TODAY with Hoda & Jenna. "So we have ten designers from all over the world and they are fighting for a million dollars. I think the only other racing event I know of is America's Got Talent which ends up with a million dollar award." Klum is also a judge on this popular hit show.