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Topher Grace is very happy for his That '70s Show co-stars Mila Kunis and Ashton Kutcher.

Like really happy.

"It's the greatest thing that ever happened," the American Ultra star told me at the Hollywood Foreign Press Association's grants banquet. "It's like two of your great friends from high school got together after high school and had a baby. And they're such a lovely couple."

Grace continued, "They're the greatest. I love those guys. It's great to know they're together. You want to all stay together when you're on a show like that...They get to stay together forever."

Topher Grace, Ashley Hinshaw

DAVID MCNEW/AFP/Getty Images

Grace now as his upcoming nuptials to think about…or not. "I don't do any wedding planning," said Grace, who is engaged to actress Ashley Hinshaw (he popped the question in January). "It is not up to me…I'm just going to show up."

Matrimony aside, Grace's career is on fire. He'll next be seen in American Ultra opposite Kristen Stewart and Jesse Eisenberg and will soon be off to shoot War Machine with Brad Pitt.

He just wrapped Truth with Robert Redford and Cate Blanchett. "I was like I am like the odd man out," Grace said of acting alongside the acting giants. "Doing scenes with the two of them, I was just trying to stay cool…He told me I could call him Bob! He said, 'Call me Bob,' and that alone was like winning an award."