In the "is this my parent/grandparent/great-grandparent?" department, there's a good chance Buzz Williams, currently the Texas A&M men's basketball coach, is the grandson or great-grandson of the most popular of the Three Stooges, Curly Howard:
Maybe it's more the similar hair/makeup/clothing they wore but I find it very difficult to tell Hedy Lamarr and Vivian Leigh apart:
Found some fan blog likening them both to Margot Kidder: There's a resemblance. OTOH ..... IMHO Brooke Adams' darker eyes (compared with Karen Allen) are really striking - and undercut the resemblance between the two.
Harry Hamlin used to be almost a pretty boy in his younger days. He's remained strikingly handsome, but in a really different way now. He's approaching Stephen Lang tough-guy territory! Really working for him.