Watch: Demi Lovato impersonate Iggy Azalea.

Demi Lovato popped by iHeartRadio in NYC and joined Paul Costabile in a game of 'Interview From a Sombrero', where she pulled out tweet challenges from a giant sombrero.

Aside from acting out her boyfriend Wilmer Valderrama's 'That '70s Show' character and singing with her mouth shut, Demi also attempted to impersonate Iggy...“I don’t know, like, he just came up to me and proposed and so that was it,” she mocked while impersonating the rapper and referencing her engagement to Los Angeles Lakers player Nick Young. “And so that was it. And I like to ride horses ... So there you go ... I’m Iggy ... I like pizza.”

Watch the rest of the video below...