It is from the movie. I looked it up. and its a deleted scene from the movie. If you want to watch it you can see it on youtube, along with other deleted scenes. I saw it and recommend watching it and other deleted scenes.
While filming the movie, there were two endings filmed, one where percy and annabeth kiss, the other which was chosen in the end. They chose the one where they do not halik because it is madami true to percy and annabeth's relationship in the book. The picture of them halik was from the deleted scene. Glad I could be of service ;)