Why Topher Grace Wasn't at Ashton Kutcher and Mila Kunis' Wedding

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Not every friend attended Ashton Kutcher and Mila Kunis’ wedding!

The couple's That '70s Show co-star, Topher Grace, had to skip their secret ceremony over the Fourth of July weekend because he was working on a project in Australia.

Topher spoke to ET at the Hollywood Foreign Press Association's Grants Banquet on Thursday about the newlyweds. "They are both amazing people so the fact that they're together now and have a kid, it's like your two great friends from high school got together after high school," he said. 

WATCH: EXCLUSIVE: Ashton Kutcher and Mila Kunis Go on Rustic RV Honeymoon to Yosemite National Park 

Ashton, 37, and Mila, 32, first met on the set of That 70's Show but didn't begin dating until April 2012. Last October, the happy couple welcomed daughter Wyatt

Back in February, Ashton taped a swoon-worthy message for Mila to see at the Los Angeles premiere of Jupiter Ascending.

PICS: EXCLUSIVE: Mila Kunis Spotted for First Time After Marrying Ashton Kutcher 

"I think I'll just keep it simple and say break a leg, and I know it's going to be amazing," Ashton said in the video recorded by ET earlier that day. "You have nothing to be nervous about, and you look stunning."

Mila's reaction was priceless. "I mean, how do you not love him, right?" she said with a big smile.

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