Ian Gavan, Getty Images
In the vid, an aged Katy sits in her luxurious mansion with her husband, but her mind is on another man -- the one that got away, that is. That former flame is an artsy, free spirit type -- played by Mexican actor Diego Luna.
Through flashbacks, we see Katy as happy as can be with her long lost soul mate ... until a fight lead her love to storm out on her.
You'll have to watch the video to see how their love story ends. Check it out below!