1. Hes been married to his wife, Keisha, since 1993. They met when they were working in the modeling world, she as an agency booker, he as a model. We've been together for so long that I really don't know any other way to be, he told Good Housekeeping in 2007. I can remember lying in bed with her years ago and having conversations about our grandparents and now our grandparents are gone. We've gone through that together, and now our parents are getting older and we're going through that together. Every relationship has its ups and downs, but I'm glad I get to go through the ups and downs with her.

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2. He and Keisha have five kids: Isabella (born in 1994), twins Maya and Kaila (1997), Eva (1999), and Jackson (2002). Our house is sort of like a nightclub, he told Good Housekeeping. We've got loud music and chaos and crowds. But really, we're pretty laid-back. Our kids are in a little band, and they like to play video games, and my wife and I do our best to live a low-key, non-Hollywood kind of life.

With his wife and three of their kids in 2009.

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3. He was born in Ohio. His parents were deputy sheriffs and hes described them as cool. Hes also a fraternal twin (in addition to being a father to fraternal twins).

4. As mentioned above, he used to be a model. He did ad campaigns for Calvin Klein, among other labels.

Calvin Klein

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Calvin Klein

5. He has multiple tattoos, including the names of his wife and children, a ring of fire, and the number 7. Its known as the lucky number in Vegas, but its known as the number of perfection in Biblical terms, hes said.

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6. He wears sunglasses to table reads. I almost feel like he's got a Johnny Depp vibe, his costar Camilla Luddington, who plays Jo, told Cosmopolitan.com last year. Super cool. Like, [he] will come to the table read, and he's in his hat and his cool sunglasses. If I did that, I would probably look douchey, but he can pull it off. He just makes everything look cool.

7. He appeared on Extreme Makeover: Home Edition in 2009. You can watch a clip of his episode; it's a little odd.

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8. He checked into UCLA's psych ward in 2008 due to a longtime sleep disorder.Its a biological sleep disorder," he told People at the time. "Your mind keeps racing, and your body is tired. It wants to go to sleep, but it cant. He said he was sleeping no more than an hour a week by the time he sought help.

9. He practices hot yoga and considers himself a "spiritual" person. He also reads the Bible and is "obsessed with the Book of Revelation," according to this "25 Things You Don't Know About Me" he did with Us Weekly mandatory reading for this PhD program, FYI.

10. He's not opposed to Meredith and Alex getting together. Im very comfortable with them being platonic like brother and sister, and friends. I think that suits them better," he recently told ET. But hey, who knows? Nobody knows how things go, you know? I was friends with my wife before we started dating. #TeamMerlex forever.

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10 Things You Need to Know If You Want a PhD in Grey's Anatomy Star Justin Chambers - Cosmopolitan.com