Beauty is highly subjective and varies from person to person.
Photobombing is when someone unexpectedly appears in the background of a photo, often to humorous effect. The "best-looking" photobomber could be someone who adds a touch of charm or attractiveness to the photo, but this is entirely based on individual preferences and opinions.
Photobombing can be a fun and entertaining element in pictures, and the "best-looking" photobomber could be anyone from a famous celebrity, a playful friend, a cute pet, or even a random stranger with a big smile. Ultimately, what makes a photobomber the "best-looking" is subjective and depends on the eye of the beholder.