United Kingdom, July 6 -- Adam Levine was convinced to splash out $5,000 on a pet pig by Blake Shelton.

The Maroon 5 frontman had just begun dating Behati Prinsloo - who he went on to marry in 2014 and has three children with - when he learned the model "really wanted" a teacup pig, but while he was unsure what the creature was, his pal offered to source one for him, even though he knew it would grow to be much bigger than the couple were expecting.

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 tea...