Kristen Cavalleri and Mark Paul Gosselaar

Emily Watson and Gary Oldman

Michael Bay and J'onn J'onzz

Janel Moloney and Shelley Duvall.

Bonnie Bedelia and Mary Stuart Masterson

I thought Gwyneth Paltrow was a dead ringer for Kate Moss in The Royal Tenenbaums.

I thought Lake Bell and Ivana Milicevic were the same person for the longest time.

James McAvoy is like a combination of Ewan McGregor and Everwood's Gregory Smith.

Cillian Murphy and Tom Welling were probably seperated at birth. One got the muscles, the other got the acting ability.

ETA: Google image search tells me that I am not alone in my opinion.

Heath Ledger and Joseph Gordon Levvit

Joh Mayer and Mika

Tyson Ritter, lead singer of the All-American Rejects, could easily be their sibling.

You win at life for linking to pictures of Tyson Ritter. He will cut you with his cheekbones!

Me too.

Pete Doherty and Isaac from Children of the Corn.

B.J. Novak and Seth Meyers

Aaaaahahahahaha!

They even have the same taste in hats.