EXCLUSIVE: Blake Shelton Reveals Why He Bought Gwen Stefani a Horse

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The couple that rides together, stays together.

When Gwen Stefani gushed over her "best present ever," a beautiful horse named Halo, last month, we couldn't help but wonder if it was boyfriend Blake Shelton that made the thoughtful gesture. Turns out, our suspicions were correct! Now, the 39-year-old country singer is opening up to ET about the equine gift.

"We got her horse and I got myself a horse at the same time," he tells ET's Nancy O'Dell in an interview airing on Tuesday. "Gwen, she loves riding and she loves horses. It's actually so funny that people are so shocked by that, but if you can name me one girl on the planet that doesn't love horses or just think that they are beautiful..."

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The gorgeous couple is headed back to the small screen after beginning their romance last season on The Voice. While Stefani is sitting this 10th season out as a coach, she will be joining Shelton as a mentor for his team.

"I mean, talk about a legendary musical icon," Shelton gushed of his girlfriend. "And somebody who has been a coach on the show, you know? So nobody knows the ins and outs when it comes to mentoring like Gwen does. She has been there for a couple of seasons. She has made it to the finale and so she knows how to talk to these people, what they need to know, you know. And it was the easiest ask ever."

No surprise here: Shelton says he only had to pick up the phone to get Stefani on board.

"I looked at my phone, like somebody from NBC said, 'Hey, you need to pick a mentor for this season,'" he recalls. "I am like, 'Hey, you want to be my mentor this season?' She's like, 'Sure.' [I said,] 'OK, Gwen said she will do it.'"

WATCH: Blake Shelton Campaigned Hard to Keep Gwen Stefani on 'The Voice': 'See You Next Season!'

Through all 10 seasons on The Voice, Shelton has remained one of the top coaches to beat. He's won the competition four times over the years, while rival Adam Levine now has three wins under his belt. "I looked ahead on the script for this season and I win," Shelton jokes. "It turns out that I actually do win. I didn't want to give away the whole season, but I actually do win."

Maybe that was the booze in Shelton's cup talking. The country superstar is partnering with Smithworks Vodka in a campaign launching on Tuesday.

Like Shelton, who was raised and still resides in Oklahoma, Smithworks was born in America's Heartland and is currently available in Arkansas, Colorado, Missouri, Kansas and Oklahoma.

“I grew up in Ada, Oklahoma, and was raised on the values of hard work, humility and an appreciation for the simple things that make up a good life,” Shelton said in a press release announcing the partnership. “As part of the Smithworks family, I’ve been involved in the development of the brand and I’m excited for everyone to finally taste what we’ve been crafting. At its core, Smithworks celebrates that moments in life are better spent with good people and great drinks.”

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Fittingly, one of his favorite Smithworks cocktails was inspired by one of his classic songs: Sip My Country Ale.

"Not to be confused with 'Kiss My Country A**,' which is one of my songs," Shelton teases ET. "That's ginger ale and Smithworks. It's just good."

Tune in to Entertainment Tonight on Tuesday for even more from our exclusive Shelton sit-down, including never-before-heard details about his next album. (Hint: New music is coming "really soon.")