Lily Allen has criticised Grammy bosses for leaving Lorde out of the best new artist field.
While the Royals singer is up for four Grammy nominations, Lily reckoned she should also have been included in the best new artist category.
"Legendary producer Jimmy Jam, who is chairman emeritus of the Recording Academy, suggested that Lorde's omission was because she, in effect "skipped a grade" by having such a successful debut song," she tweeted.
"'She is still very new,' he told CNN. "Sometimes I think the Grammy voters like to say 'Well, let's see what else you have before we say you're the best new artist.'" AT WHICH POINT SHE WONT BE A NEW ARTIST !!! what c**p."
Lily - who is at the top spot in the UK charts with her version of Keane's Somewhere Only We Know - added: "I guess what defines 'new artist' is 'not yet having a grammy', yes always a new artist until you've won. that makes sense. #SHAMMYS #lordemusic rocks."
Lorde - whose real name is Ella Yelich-O'Connor - has received four Grammy nominations, with her debut album Pure Heroine in the running for the best pop album.
The 17-year-old New Zealand singer's chart-topping single Royals has been nominated for song of the year, best solo pop performance and record of the year.
Jay Z led the Grammy Award nominations with nine nods, followed by Justin Timberlake and Pharrell Williams with seven apiece.
The winners will be announced at the ceremony on January 26, 2014.