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Mila Kunis, Ashton Kutcher

Noel Vasquez/GC Images

Happy birthday, Ashton Kutcher!

The multi-hyphenate star is celebrating his 38th birthday today, yet another hard-to-believe reminder it's been nearly a decade since the That '70s Show cast rocked their final pair of bell bottoms together. But since starring alongside his TV sweetheart turned IRL-wife Mila Kunis and the rest of the gang, Kutcher has made the quite transition from the lanky, adorably dopey Michael Kelso to a wildly successful actor-entrepreneur and dedicated father. 

Even when he replaced Charlie Sheen on Two and a Half Men, that was practically a side gig, he had so much going on. The tech junkie has gone on to invest in (and launch) a number of well-known startups, co-found an international human rights organization and was even tapped to become a product engineer for Lenovo

As for his personal life, Ashton isn't doing half bad either. Prior to tying the knot with his former co-star last summer, the lovebirds welcomed their first daughter, Wyatt Isabelle, on Oct. 1, 2014.

And if you're still skeptical as to how Ashton really shed his Dude Where's My Car image after all those years, check out the proof right here:

Ashton Kutcher Facebook

Facebook

While Kutcher might have had to adjust to the balancing act that is fatherhood, the No Strings Attached star told Conan O'Brien just a month after welcoming Wyatt, "It's unbelievable. It's the greatest thing on earth. As soon as this child was born I immediately wanted to call my parents and just apologize because I never knew how much they loved me."

Mila Kunis, Ashton Kutcher, That 70's Show

Larsen & Talbert/FOX

Even That 70's Show alum Topher Grace is amazed by how Ashton and Mila's love for each other has evolved since they first met on set in 1998. "It's funny, 'cause it's fascinating to everyone but it's fascinating to people in the cast, too," Grace revealed to Bravo's Andy Cohen. "Because, no. I mean, we were all buddies, but... It's so great. It's like two of your best friends from high school, like, met years after high school and got together. It's so cool."

Fun fact: Mila's first kiss was with Ashton while filming a scene. Aww!

Ashton Kutcher Mother's Day Gift Surprise

HOUZZ

Long before becoming a family man, Kutcher was fairly notorious for his jokester persona (Do his days on Punk'd ring a bell?). Now, Kutcher makes time to give back to his loved ones. Calling the project a "lifelong dream," the hunky celeb gifted his mother with a newly remodeled version of his childhood home on Mother's Day last year.

"My mom has been the greatest influence in my life—my parents gave me everything," he expressed. "They went to great sacrifices to give me the life that I have and anything I can do to say thank you is the right thing."

Ashton Kutcher, Mila Kunis, Twitter

Twitter

Leave it to a real man like Ashton to take on the less appealing aspects of babies with stride. Speaking to Luxury magazine, Kunis said, "My husband is an incredibly hands-on dad. When my child was born, I was breast-feeding and he said, 'That's your connection. I want to change every diaper.' When we're in public, if it's a pee-pee diaper, you can change her at the table, but if it's a poo-poo diaper, you don't want to affect the people eating. So he's like, 'Err, I guess I'm going to the ladies' room to do it.'"

Ashton Kutcher, Change.org

change.org

Speaking of diaper duty, it appears becoming a father has also made quite the social activist out of Kutcher. Back in March, Ashton launched a Change.org campaign calling on two major retailers, Target and Costco, "to provide universally accessible changing tables in their stores."  

Prior to this, Kutcher took to Facebook to vent, "There are NEVER diaper changing stations in men's public restrooms. The first public men's room that I go into that has one gets a free shout out on my FB page! #BeTheChange"

Ashton Kutcher, Mila Kunis

FOX via Getty Images

With so much attention surrounding gender inequality within Hollywood, leave it to Ashton to speak up for his own leading lady. Lamenting over a recent press junket in which reporters only asked his wife, "What dress are you wearing?" Kutcher, responded, "Granted, I prize her as the most valuable person in the world to me. But you had a chance to sit with Mila Kunis and that's what you asked her?"

You tell 'em, Kutcher! We might have another Matt McGorry on our hands.

Ashton Kutcher, Mila Kunis

Noel Vasquez/GC Images

When Ellen DeGeneres asked if the new parents would be enlisting the help of a nanny to help take care of Wyatt, Ashton offered a resounding negative. "We just want to know our kid," he dished. "We want to be the people that know what to do when the baby's crying to make the baby not cry anymore. We want to know when she makes a little face or something. We want to be emotionally in touch with her, and I think the only way to do that is by being the one who's there."

Mila Kunis, Ashton Kutcher

Splash News

Talk about thinking for the future. Kutcher has always been social-media savvy, and as such, he's taking every caution to protect his daughter. "We immediately went home and we reserved all the domain names. We got the Twitter handle, the Instagram—everything that you could possibly [have]," he revealed on Conan. "I don't want a porn site with my daughter's name! It's unacceptable to me and it's not gonna happen!"

Mila Kunis, Ashton Kutcher

Instagram

Last—but certainly not least—the woman who knows Kutcher possibly better than anyone else summed up his transition from immature lad to macho man in the most wonderful way. 

"[Ashton] smells like a man," Mila gushed during a Reddit AMA. "A real man! But he smells like a man. He does not wear cologne. But he makes sure he showers. Never offending. He has a very good natural smell about him, yeah."

Hey, if you've got it, flaunt it! Here's to wishing Ashton and his adorable family the best year yet.