when I look at this image, the waltz from "the Cat Returns" pops into my head ... and I LOVE IT~!!! XD I just love this image; I really really REEAAALLY want to jump through the computer and come out onto that sidewalk~!!!!
No, "the Cat Returns" is an animated movie by Studio Ghibli about a girl who saves a cat (who turns out to be the cat prince) and is then captured by the king so she can marry his son/the prince. Before she's captured though, she meets and befriends a character called the Baron who helps her escape the cat kingdom.
At one point during the movie, a royal ball is being held in honor of the "bride". A whole bunch of performers are trying to make her smile, but she's too distraught to care (since she's slowly turning int a cat herself). Then one comes up and asks her if she'd like to dance and she agrees. During the dance she realizes that her dance partner is Baron, come to rescue her.
I can't find a proper link for the song, but this is as close as I could get -> [link] ; it's not the actual scene, but it is the song.
ps- if you have not since "the Cat Returns", I highly suggest it to you.