EXCLUSIVE: Thomas Rhett Gushes Over the 'Sweetest Thing' Daughter Willa Gray Does When He's on the Radio

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Thomas Rhett isn't like a regular dad -- he's a cool dad. 

The 27-year-old country star and wife Lauren welcomed two baby girls amid a banner year for his career. Rhett's been busy on his headlining Home Team tour since March and just last week became the first country act this year to top the all-genre Billboard 200 chart. 

"I was really surprised," Rhett tells ET. "I think as an artist, anytime you put a record out, you're just like, 'I hope people like it.' And so when you see your record go No. 1 and stay there for an entire week, that was just a huge feat for me and the team. I'm just so happy for the writers and the people that played on the record because we put a lot of hard work into this record." 

When it comes to picking favorites, Rhett says that wife Lauren is a fan of "Sweetheart," while 1-year-old Willa Gray gravitates towards the EDM-flavored "Leave Right Now." 

Rhett also couldn't help but gush over the adorable thing that Willa Gray does when she hears dad's singles on the radio. 

"Whenever she hears 'Craving You' or 'Unforgettable,' she says 'Daddy! Daddy!' It's the sweetest thing in the world," Rhett beamed. 

ET caught up with Rhett at his fashion pop-up shop in Los Angeles, featuring collaborations with Daniel Patrick, MadeWorn, New Era caps and his personal stylist, Kemal Harris. While he hasn't yet ventured into baby and toddler fashion -- "We should have made a onesie!" he laughed -- he did open up about how much fun he's had teaching his eldest daughter about fashion and how he's balancing parenthood with a demanding career. 

See the full interview on Friday, Sept. 29, on ET's "Certified Country," which runs every Friday on ET's YouTube and Facebook pages. 

In the meantime, you can check out all the latest episodes -- including, most recently, a hilarious game of emojis with Dustin Lynch -- here.