Speaking at the Twilight: Breaking Dawn - Part Two premiere, the 16-year-old singer claimed that she was still struggling to get her head around the fact that she was being invited to red carpet events.
Watch our interview with Ella Henderson below:
"This is absolutely madness. It's so strange and surreal," she told DS.
Teasing her performance this weekend, she said: "I can give you some little insider facts. I'm doing a song that absolutely everybody knows, but nobody's ever heard it sung this way. It's exciting."
Commenting on who she would like to duet with if she reaches the final, Henderson added: "I can't even look that far ahead. But if I was to be in the final it would have to be between Adele and Beyoncé."
X Factor continues on Saturday (November 17) with a Guilty Pleasures theme.
Photo gallery - Twilight: Breaking Dawn - Part Two UK premiere:
Copyright: PA Images Dominic Lipinski/PA Wire