The Fountainhall pupil's wintry design won first prize in the Secretary of State for Scotland's annual card competition.
Mr Moore admitted it had taken a special design to win. He told the Border Telegraph: "I received so many fantastic entries to the Christmas card competition from schools across the Borders so it was very difficult deciding on a winner.
"After much deliberation, I chose Millie's design and it was great to be able to congratulate her in person last Friday. Her artwork will appear on the front of my Christmas card this year and will be sent to hundreds of my friends, family and colleagues.
"I want to thank all the students who took part in my Christmas card competition for their brilliant creative efforts. A special congratulations is also due to the eight runners up whose entries are now on display in my constituency office window and being admired by many passers-by."
The eight runners-up for 2012 were Charlotte Tuckwood P3 Kirkhope Primary, Rhiannon Gerrard P7 Glendinning Primary, Gosha Czerwinska Drumlanrig Primary, Liam Hyslop P6 Heriot Primary, Ryan McMichan P3 Drumlanrig Primary, Sophie Bell P5 Heriot Primary, Kyle Lothian P3 Balmoral Primary and Olga Burt-Smith P7 Kirkhope Primary.