4. Steven Tyler
The Aerosmith frontman and one-time “American Idol” judge long ago cemented his legacy as one of the most famous pop singers of all time. But after years of touring and gyrating on stage, Tyler has developed a condition known as Morton’s neuroma, which causes the toes to begin growing on top of each other instead of out straight. In Tyler’s case, the toe next to the big toe on his right foot has bent sideways and rests on top of the big toe instead of next to it. It’s a painful condition caused by irritation of the nerves in the third and fourth toes. Tyler has had several surgeries, but the problem persists.