The 25-year-old reassured her 55.7 million followers their friendship was not on the rocks.
"Media, when you say "Lorde & Taylor are fighting"- by fighting do you mean "FaceTiming constantly from US to NZ and LOLing at you"? Thnx bye," she tweeted.
The singer - whose real name is Ella Yelich-O'Connor - took home top rock song for her hit Royals, and was named the top new artist at last year's Billboard Music Awards.
This year, Aussie rapper Iggy Azalea is nominated for the top new artist award, among her total of 12 nominations.
The Mullumbimby rapper follows Taylor Swift, who racked up 14 entries, and Sam Smith, who scored 13 nods.
Sydney group 5 Seconds of Summer are also nominated for two awards, including Top New Artist and Top Duo/Group.
Katy Perry, Ariana Grande and One Direction will also be honoured on May 17 at the MGM Grand Garden Arena in Las Vegas.