In the same year, the brothers co-founded M13, a venture capital firm whose name was inspired by the Messier 13 star cluster, according to the company’s website. It explains that the cluster is, “Full of remarkable individual stars. But when those stars come together, they create something that’s truly greater than the sum of its parts. At M13, we’ve learned the same.”

M13 has invested in dozens of companies such as Lyft, Pinterest, Snapchat, Ring, Bird, Warby Parker, SpaceX, Girlboss, Headspace and Rubicon. It has more than US$137 billion in enterprise value, according to Global AgInvesting. Carter’s own net worth is about US$35 million, according to Showbiz Cheat Sheet.

He is also on TV

Unlike his iconic fiancée, Carter isn’t really on the reality TV scene. However, he has appeared as a guest and a commentator on popular TV networks such as CBS and Fox.

He has also appeared in Hatched, a nationally syndicated TV series where entrepreneurs pitch their ideas to business and retail experts, as per PR Newswire.

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He is an author

Carter contributes to media outlets such as HuffPost and Inc., and the Reum brothers even co-wrote a book, Shortcut Your Startup: Ten Ways to Speed Up Entrepreneurial Success. It tells of their professional career stories and guides new entrepreneurs on ways to reach their goals. Amazon describes it as a “practical playbook for both aspiring and seasoned entrepreneurs, filled with unconventional yet accessible advice for maximising your business venture”.

One of their key pieces of advice? Entrepreneurs should focus on perfecting their product before attempting to expand. Ahead of the book’s launch, Carter wrote on Instagram: “Not every business is a speedboat. In fact, most businesses are sailboats. Our start-up, Veev was a sailboat. We focused on nailing our systems down tight before we scaled. This worked well for us when we went to sell.”

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He works hard … possibly too hard?

With such a busy life, Carter definitely works very hard, and this is the only thing “not perfect” to Hilton, she revealed on her podcast This is Paris earlier this year. “This man works harder than anybody I’ve ever met in my life. I thought I worked hard. He blows anyone, myself and anyone, out of the water,” she said.

However, later she admitted to USA Today that he motivates her to work harder and “makes me feel like I can be the best woman I can be”.

Recently, Hilton also revealed that her other half doesn’t like the camera, red carpets or interviews because he wants to focus on his business. So how will that work with Paris in Love, we wonder?

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Paris Hilton calls him her “soulmate”

The couple recently went on a yachting holiday in Corsica that Hilton called a “paradise” on Twitter. But not only that, Glamour reported that she’s been on cloud nine ever since the pair met. She also calls him “a fairy tale”, as well as her other half, twin flame, soulmate, missing piece and everything she “has dreamed about” on her social pages.

“I feel like the luckiest girl in the world because I have you. You opened my heart in ways that didn’t exist. You are the most extraordinary person I’ve ever met. You transformed my life in so many ways. I never thought it was possible to have this much love for someone,” she wrote in an anniversary Instagram post.