While Hollywood legend Brad Pitt might be known more for his starring roles on the big screen than cameos on the small screen, his latest appearance on TV might just be one of his most emotional yet.

Yes, the 56-year-old actor, who has starred in films such as Once Upon a Time in Hollywood, Fight Club, Moneyball and countless other acclaimed flicks, joined Drew and Jonathan Scott for Celebrity IOU.

The role? To give his close friend, make-up artist Jean Black, a new guest house.

Watch a sneak peak of the emotional moment here:

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Brad described his relationship with Jean as "like brother and sister," and revealed that they had worked on 40 movies together over the course of their careers.

"She's family, we're like brother and sister. She's been that person I value so much in my life," the actor said of his friend, before getting to work to transform her garage into the guest house of her dreams.

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The actor said of the process, "I love the sound of a construction site. If I'm not building, I'm dying. Just walk into a place and just see the possibilities."

And Brad was highly involved in the details of how the guest house would look, too. Per the Mirror he said;

"She's got a lot of these washed-out pewters and taupes in her place. So that would be a natural carry-through...

"I'm extremely tactile. In fact, I prefer the design be more in the materiality than actual decor or decoration. Seeing how the materials relate to each other and the feeling you get living amongst them."

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Needless to say, the end result was extremely warmly received by Jean, who said of her brand new guest house;

"I'm really just so flabbergasted. It's really very moving and I just so appreciate it.

"I know Brad's generosity, it's huge. But for him to do this, it's really more than I ever thought could happen.

"I am so touched by this, I could really not thank you enough."

Great work, Brad!

Brad Pitt moved to tears as he surprises best friend with brand new guest house