At only 24 and having released just one album, she's by far the youngest and most inexperienced member of the panel.
“I’m still pinching myself that I’m here," she told the Daily Star Sunday. “Just over a year ago, people were like, ‘Have you heard that new girl singing Do It Like A Dude?’ Now I’m on the panel as a coach on The Voice.
“I’m still in a daze, to be honest, because everything I look for I’m still looking in myself for.
“I’m still in the early days of my career and working out what I need to do to survive, so that’s what I’m projecting."
But the fiesty performer reckons she deserves her place on the panel alongside the likes of Will.i.am and Sir Tom Jones, saying it's a mix that works well.
"It is such a strong and varied line-up," Jessie told the newspaper this weekend. “I’m like a sponge around Tom, just soaking up all of his longevity and timeless energy.
“He talks about hanging round Elvis and being friends with Tina Turner and I’m just, like, wow. He really is a true legend.”
The Voice UK live shows kick off on Saturday.