Depends on how you define success. I don't think being famous or making a lot of money means you're successful. A lot of people can get those things through deceit or just being born to the right parents.
Sports is probably the closest thing to a true meritocracy we have in the world. And in that sphere we see that the most successful stars are good-looking. Very few ugly athletes become recognized as the best at their sports.
The 3 greatest Americans athletes of all-time are among the best looking Americans of all-time as well.
Muhammad Ali
Michael Jordan
Jim Brown