Blake Shelton Praises Girlfriend Gwen Stefani as 'Hot' on 'The Voice'

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Blake Shelton couldn't contain himself when it came to his girlfriend, Gwen Stefani, on Monday's episode of The Voice.

Stefani returned to the singing competition show once again as a mentor for Team Blake, and she met with singers Jared Harder and Adam Wakefield, who would face off in the battle round.

Shelton introduced the singers to his lady love, referring to her as "the great Gwen Stefani," and he could hardly keep the adoring smile off his face.

WATCH: Gwen Stefani Returns to 'The Voice,' Teases Boyfriend Blake Shelton: 'I Think You Need a Lot of Help'

"Blake wanted to bring in an expert to help you guys, so called me," Stefani told the hopefuls.

"A country music expert," Shelton added, playfully, to which she responded, "I’m getting there though! I loved working outside of my lane."

The 39-year-old country crooner couldn’t help but add one addition piece of information about Stefani, noting, "Also, she's hot."

WATCH: Blake Shelton Makes Gwen Stefani Blush Over 'Booty Call' Remark on 'The Voice'

It was a genuinely cute moment between the sweet couple, who have been keeping things super professional while working together on the program.

Outside of the studio, however, the two just keep getting closer.

Earlier on Monday, Shelton appeared to have spent some quality time with Stefani's youngest child, Apollo, as the trio went on a hike.

The 46-year-old No Doubt frontwoman documented the adorable outing on Snapchat, sharing a video of someone who sure looks like Shelton ambling around with her 2-year-old son.

WATCH: Gwen Stefani and Blake Shelton Celebrate Her Son Apollo's 2nd Birthday With Plenty of PDA

Over the weekend, Apollo was insanely adorable while accompanying his mom to her friend's wedding in Orange County, California. Check out the incredible cuteness in the video below.