Adam Levine was convinced to splash out $5,000 on a pet pig by Blake Shelton

Speaking on Hot Ones, Adam said: "My now-wife, then-brand-new girlfriend, she said she really wanted a teacup pig.

"And I didn't know what that was, but of course the first person I would ask [would be Blake]... So I asked Blake. I'm like, 'What's a teacup pig?' He's like, 'I'll get you a teacup pig. Yeah, give me five grand.' "

But after just three weeks, Adam and Behati rehomed the creature - and were stunned to see how it had developed months later.

The 46-year-old singer said: "We had to give it to a little girl on a farm. We're like, 'Send us pictures! We can't wait to not be responsible for this animal anymore! Just show us pictures!'

"She sends us a picture like six months later and the pig is like 400 pounds. I'm like, 'Dude, what if this animal had grown to be this big in my house?!'"

The Moves Like Jagger hitmaker then confronted Blake about the size of the supposed "teacup pig", and the country star admitted he had "pranked" his pal because he knew there was "no such thing" as miniature swine.

He said: "I'm just like, 'Blake, bro, $5,000 for a pig that wasn't a micro pig?' And he's like, 'You're an idiot! There's no such thing as f****** teacup pigs, you dumbass!' So that was a pretty good prank that he played on me."

And to make the situation worse, Blake refused to give Adam any of his money back.

Adam said: "He's like, 'No!'"

Adam recently spoke of why he agreed to return for season 27 of The Voice after departing his role as a coach during season 16.

He told reporters: "I honestly feel like the stars aligned.

"It was one of those moments where we started talking about it and it felt right... and it hadn't felt right until now."

Adam, who had spent nearly nine years on the show, admitted he needed a break from the relentless schedule that came with the job.

He said: "Doing it for so long, so consistently... you can definitely start to get burnt.

"I started to feel like I was kind of getting away from things that matter to me the most, like making music and playing music."