Spencer Pratt claims he and Heidi Montag were once as famous as Taylor Swift and Calvin Harris

He told PEOPLE: "Taylor Swift and Calvin Harris? That was us. We were that for a moment, so to feel so different now, it's like, 'Wow.'

"We were so famous, and now we're so not. To see both sides of it is really eye-opening."

Spencer and Heidi, 29, no longer have the profile they once had and Spencer admitted he hates feeling "irrelevant".

He explained: "I almost miss the haters. Because if I don't see them I'm like man, I'm irrelevant for real."

While Heidi and Spencer have dropped out of the spotlight, Heidi's former stylist Kim Kardashian West has gone on to become one of the most famous women in the world, but Spencer insists they are not jealous.

He said: "I love success, especially for reality stars. So when I see Kim getting millions of dollars, I know it's just eating haters alive.

And I enjoy it!"

Spencer previously revealed that Kim, 35, was desperate to be involved in their MTV show 'The Hills' before she found fame.

Spencer said: "She used to call Heidi to arrange Heidi's closet. Kim was edited out of 'Hills' episodes sorting out Heidi's closet. Now it's like, 'Kim Kardashian breaks the internet with her booty.' Like, what the? That's real life for us."

'The Hills' first aired in 2006 on MTV while Kim's family show 'Keeping Up With The Kardashians' followed in 2007 on E!