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

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Things are heating up over on The Voice!

New lovebirds Blake Shelton and Gwen Stefani may have played it low key during the first round of live shows last week, but on Monday’s live taping, the couple’s flirting was on full display.

After contestant Amy Vachal took the stage to sing a sexy, acoustic version of Drake’s radio hit, “Hotline Bling,” Shelton was beyond impressed by her tasteful reinterpretation of a song about a late-night hookup.

WATCH: Blake Shelton and Gwen Stefani Awkwardly Perform 'Hotline Bling'

“I don’t think there’s ever been a more elegant and classy performance of a song about a booty call in the history of music,” Shelton said during Monday’s live show. “I mean that was, like, unbelievable. I hear that song on the radio every day. That song’s so big even I have heard it.”

The 39-year-old country singer has definitely heard the song at least once before, when he and Stefani sang it during an October appearance on The Tonight Show Starring Jimmy Fallon just one week before their romance became official.

“Gwen sang it to me on the Tonight Show one night, so…,” Shelton said, eliciting hoots and hollers from the audience. When the camera panned to Stefani for her reaction, she was clearly flustered. Is it just us or did it suddenly get… hot in here?

WATCH: Blake Shelton Jokes He's 'Fertile' After Gwen Stefani Pregnancy Rumor

“OK... thank you Blake,” host Carson Daly said, attempting to divert the attention away from what just transpired – only fellow judges Pharrell and Adam Levine could not contain themselves. It took Pharrell several moments to compose himself! “OK, this is your moment… Wow,” Pharrell could only muster as he laughed through the awkwardness.

“Definitely better than the version we did on Fallon, for sure, 100 percent,” Stefani said when it came time for her to say her critique to Vachal. If you listen carefully, you can still hear Pharrell giggling throughout!

Before the live show began, Stefani and Shelton didn't hide their sweet PDA. The No Doubt singer ran to Shelton's arms for a big hug when she took the stage.

ET caught up with Shelton ahead of Tuesday’s taping to get the dirt on the reported song he and Stefani wrote together.

WATCH: Gwen Stefani Gets Emotional on 'The Voice' Amid Gavin Rossdale's Alleged Affair

"I'm not saying that I've written a song with Gwen, but I'm not saying that I didn't,” the country crooner told ET, skirting around the question. “Ooooh! Controversy! Tabloids! Hello!"

While Levine is Team Gwen and Blake, fellow Voice coach Christina Aguilera – who will return in season 10 – is also behind the new couple, telling ET recently, “They deserve happiness, especially when you have to deal with a lot of the press crap and everything.”

The Voice next airs Tuesday at 8 p.m. PT/ET on NBC.