Near the bottom left of the desktop, or upper left of the frame, there is a photo of a cat wearing glasses. Common enough, but this specific feline is notable for a few reasons.
This British shorthair cat is LiLu, and its owner, Russian photographer Andy Prokh, took a collection of photos between 2010 and 2012 that shows the relationship between his daughter Katherine and LiLu, and the gallery went viral.
This photo is the most famous one of the set, and the one Prince has on his desktop. LiLu also became the star of many The Matrix memes and is more commonly known as Morpheus Cat. Interestingly, this photo has also been edited to have Prince's logo in the lenses of the glasses: