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The two singers, who are nominated for 'Really Don't Care' and 'MMM Yeah' videos respectively, will battle fellow nominees 5 Seconds of Summer, Katy Perry and Ariana Grande.
The annual awards show also features performances from MAGIC! who plays their hit single 'Rude' and Rixton who sings 'Wait on Me' and 'Me and My Broken Heart'.
The former Jonas Brothers member describes the duet, presumably titled 'Avalanche', as 'a great song' that will feature Lovato's 'amazing' voice.
The 'Heart Attack' hitmaker shares a photo of her styling her new short do in a Twitter post, writing, 'Just went shorter!!!!'
The singer posts a photo of her and her duet partner, presumably Jonas, giving a thumbs-up inside a recording studio.
The hacker posted on the 'From Prada to Nada' actor's Twitter account both topless and nude photos of a girl who's said to be Demi, saying that the 'Let It Go' singer was 'fat as f**kk.'
Shot earlier this month at the annual L.A. Pride parade, the clip features a blink-and-you'll-miss-it cameo appearance from Wilmer Valderrama.
The former Disney star also hopes that her 'Camp Rock' co-star will be involved on her upcoming 'Demi' world tour.
The 'Heart Attack' hitmaker shares a story of her grandfather as she presents an award to 'Orange Is the New Black' at the Logo TV Trailblazers event.
The full visuals, which was shot earlier this month at the L.A. Gay Pride Parade, is set to be released on June 26.
Lovato joins Sheeran onstage for the amazing performance during his set at 104.3 MY FM Presents My Big Night Out at the Hollywood Bowl.
The former 'X Factor (US)' judge also performs 'Neon Lights' and 'Heart Attack' from her latest album 'Demi' during her appearance on the show's summer concert series.
The 'Camp Rock' star recently shared some pictures of her new hair color on Instagram.
Lovato will be joined by Christina Perri and MKTO for the tour, which will open in Baltimore on September 6.
The clip features the singer joining some of her die-hard fans to lip-sync the catchy song while dancing to it.