From the googlevideo page:
Also known as "Wedding Bells". "Tom and Ellen Bowen are a brother and sister dance act whose show closes in New York. Their agent books them in London for the same period as the Royal Wedding. They travel by cruise ship where Ellen meets and becomes involved with Lord John Brindale. This causes her to miss a rehearsal." Directed by Stalney Donen, story and screen play by Alan Jay Lerner, 1951.
Fred Astaire has a hat rack as a dancing partner in this one. It's perfect for mindless entertainment, which is just what I need sometimes.