This is part of the Preston Sturges season at BFI Southbank, the screening of this movie are on film and also being shown on March 11th. You can find the full details here.
Chicago Reader review:
Preston Sturges's affably blasphemous version of the Nativity, with Betty Hutton as a World War II good-time girl who finds herself in the family way after a dimly remembered night with a soldier whose name may or may not have been Ignatz Ratzkiwatzki. The real miracle is that Sturges got all of this past the production-code office in 1944, particularly the arrival of Hutton's blessing, as scheduled on Christmas morning, in the form of sextuplets. Caustic and chaotic in the arch Sturges manner, it's probably his funniest and most smilingly malicious film. With Eddie Bracken and William Demarest.
Here (and above) is the trailer.