Not everyone thinks that guys with cleft chins are attractive, yeah. But traditionally that has been a trait that people associate with manliness or hotness in a guy (you see it mostly used to caricature these traits nowadays though).

And yeah, Adele is one attractive female celebrity I can think of who has a cleft chin. I wonder how many others there are, though. Is this something that can be surgically removed? Maybe actresses and pop musicians typically have it removed?