Billy Bob Thornton -- All Growed IN

12/16/2010 8:25 PM PST

Billy Bob Thornton -- All Growed IN

The longer Billy Bob Thornton is famous, the longer his hair gets.


Here's the 55-year-old star at an event in L.A. on Wednesday (left) -- and the less hirsute version back in 1997 (right).

Unbeweavable ... we're just sayin'.