4. Woody Harrelson
Woody Harrelson’s father, Charles Voyde Harrelson, was a notorious hitman convicted of assassinating a federal judge — the first such killing in the 20th century. Woody has openly discussed the possibility that he and Matthew McConaughey share the same biological dad.
The two actors even considered a DNA test but backed out because Woody feared the truth. This explosive family secret remained hidden from tabloids for years, far from the carefree surfer-dude image paparazzi love to sell.