Actress/singer Demi Lovato has revealed she has a love/hate relationship with best friend Miley Cyrus - because the two stars are such fiery characters.

The Skyscraper singer insists she wouldn't be able to survive without pals Cyrus and Selena Gomez, who helped her get through a rehab stint at the end of 2010 - but they're not always the best of friends.

Lovato tells the new issue of Seventeen magazine, "No matter how many times we fight, we will always be in each others' lives, but (Miley and I) are very strong-headed, so when we fight, it's brutal and we're like, 'We're never going to be friends again!'

"Then, two days later, we're like, 'I love you and I miss you!''

"Selena and I, we never fight. She's not a confrontational person at all."