The 'Burn' singer admitted she expected to see the 26-year-old star up for at least one award at the celebration of British musical talent - which will take place at London's O2 Arena on February 25 - because her ''incredible'' voice is one of the best in the world.
She said: ''I was surprised by that because she's an incredible pop star.
''It sounds weird saying that, but she is. She nails it and she still has one of the most incredible voices in the world. So that shocked me. But I don't know how the voting works!''
The 'Burnin' Up' hitmaker - who released her third studio album, 'Sweet Talker', last year - was snubbed across all categories, missing out on the British Female category to Ella Henderson, FKA Twigs, Jessie Ware, Lily Allen and Paloma Faith and also being ignored on the Mastercard British Album shortlist which includes no female acts.
The flamboyant singer rose to fame thanks to the BRITs Critics' Choice Award which she won in 2011, and has since been nominated for British Breakthrough Artist in 2012, British Single in 2012 and 2013, and British Female Solo Artist in 2012 and 2014.
Meanwhile, Ellie, 28, picked up the 2014 award for British Female Solo Artist, but is pleased she was not eligible for the award this year as she has found the ceremony to be too stressful in previous years.
She explained to Capital FM radio station: ''I knew that I wasn't eligible for anything this year and that was actually such a relief,'' she added. ''It's nice to not have to worry. If I do go it means I get to go and chill out and see my friends!''
We explore the musical culture of Camden as Madness and Amy Winehouse receive their stones on the Music Walk of Fame.
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