Demi Lovato has issued a warning to Kanye West following the ‘Yeezus’ rapper’s proposal to reality show star Kim Kardashian.

Speaking to E! News Online Lovato stated: “I've told Kanye before that if he doesn't treat her well, I'm going to come after him.”

Kanye West elaborately proposed to Kardashian earlier this week. West’s proposal involved a baseball stadium, an orchestra and a large diamond ring.

Talking about her relationship with Kim, the ‘Let It Go’ singer explained: “I've known Kim for years and she's been such a good friend to me during some really hard times.”

Demi also expressed her approval of West’s engagement ceremony and excitement to toast the bride-to-be: “She deserves that Giants stadium! Thanks for telling me - now I can go congratulate her!”

Following her acceptance of Kanye’s proposal Kim Kardashian pronounced herself to be “the luckiest girl in the world”.

Listen to Demi Lovato's latest song 'Let It Go' below: