Hundreds turned out clad in their best 1940s get-up to the Black Country Living Museum, in Dudley, to watch the D-Day Darlings.
The group, who formed a decade ago and impressed judges on the ITV show earlier this year, wowed crowds between two performances with their wartime songs.
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Katie Ashby, of The D-Day Darlings, said: "It was truly amazing to be part of the Christmas on the home front event.
"We've been performing at our beloved Black Country museum For almost as long as the D-Day Darlings have been going and we feel like we're coming home each time we return here.
"It is one of our most favourite events in our calendar. We owe so much to venues and events like these, for it's the loyalty and belief in us, for all those years, that has helped us on our journey to where are are now and we are so very grateful.
"We are so proud of all our achievements, keeping those memories alive for our heroes and helping the younger generation to appreciate the huge sacrifices made for them. We can't wait to return to the museum again."
Black Country Living Museum spokesperson, Grant Bird, said the museum were 'lucky' to secure members of the group again for the sell-out 1940s Christmas theme event.
The appearance follows their performance at the museum's summer 1940s weekend, which proved a massive hit with visitors.
Grant said: "Having the D-Day Darlings at out 40s events brings something special.
"Their performances are always incredibly entertaining and they have an appeal that spans generations. We love having them appear as part of our 40s events.
"We have a lot of things going on, we have food and drinks, and reenactors walking around the site. It is a real mix of people here. Our next 1940s event will be in June next year."
The D-Day Darlings visited the museum just weeks after they had released their debut album I'll Remember You – featuring iconic wartime classics such as We'll Meet Again.
They release the album just two days before the centenary of Armistice Day after signing a record deal with Sony Music UK.
The nine-piece group, who perform in period military uniforms, began as a trio singing in elderly care homes.