The singer, who won BGT in June, appeared alongside several other notable performers at the annual fundraising event.
Christmas delivered her song “Believer” backed by Dave Arch and The Royal Variety orchestra, wearing an elegant strapless gown adorned with embellishments, complemented by silver jewelry and heels.
The lineup for this year’s show included an impressive roster of musical talent, featuring Eurovision winner Nemo, three-time Brit Award recipient James Bay, and Sophie Ellis-Bextor, who performed both her recent hit and her classic track “Murder on The Dance Floor.”