The 'It's My Party' singer showed off her toned midriff in a knitted top with a sheer panel.
She colour coordinated her look with black and white panelled skinnies, tucking her long pins into pointed black boots.
The singer, who quit The Voice to commit to her music career, accessorised with her signature hoop earrings, white nail polish and natural make-up.
Previous Facebook Live events have featured the likes of Rihanna and Madonna, and Jessie said it was an honour to be involved this year.
Not only has the starlet got our vote for her softer image, she's also released her second album Alive this week, which is in the running for number one this Sunday.
The sky's the limit for this popstar!
By Harriet Osborne
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Watch Jessie's music video for 'It's My Party' below: