March 26, 2018 11:21 AM

Sometimes it’s the little things that can make the most lasting impression on somebody’s life.

So who do some of the biggest names in entertainment have to thank for influencing their journeys?

“I think I have to give that to Yolanda Hadid for introducing me to Real Housewives,” star Erika Girardi tells PEOPLE. “That was an unexpected life changer.”

Margot Robbie cites her “Aussie agent” for helping her navigate the business side of show business: “I said the other night at an awards show, I would not be standing here if it wasn’t for him.”

“Someone told him about me when I was working on a show called Neighbors, which is a show in Australia. Someone said to him like, ‘Oh, you should check out this young girl, she just got negotiated the worst contract in history, so she probably needs a bit of help.’ And he stepped in and became my agent after that, it was great,” she adds.

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As for Nate & Jeremiah by Design stars Nate Berkus and Jeremiah Brent, the proud dads say they learn from their 3-year-old daughter Poppy every day.

“No one I think has changed both of our lives more significantly than that little 3-year-old with the exact same face and teeth as this person,” Berkus explains while gesturing to his husband.

RELATED: Allison Janney, Adam Rippon and Gus Kenworthy on the People Who Inspired Their Journey

And Spencer Pratt thanks his wife Heidi for being “an angel” and making him want to be a better person.

“As cheesy as that sounds, it’s true,” he says. “When you’re around somebody who’s so loving all day long, it’s hard to be negative, even when you try really hard.”

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