By now, we're all familiar with the blogs 'Totally Looks Like' and 'Cannot Unsee.' A new blog called 'Facemath' has taken the best elements from both of those popular online destinations and added arithmetic to give us the recipe for famous facial deconstruction.

A glimpse at the site's archives suggests it began in June 2010, averaging about three "equations" per month since. How do you get Katy Perry's unique features? Just add some Lizzy Caplan to Zooey Deschanel. Who's the missing link between James Franco and his little brother, Dave? Cristiano Ronaldo. What separates Chris Hemsworth from Liam? John Krasinski. Other notable formulas include ALF and Val Kilmer, Carrie Brownstein and Justin Long and Al Gore paired up with Arnold Schwarzenegger's suffocating face from 'Total Recall.'

You'll find 10 of the best equations that we could figure out below. There are plenty more that'll add a smile to your face on the Tumblr, but the lack of labels might just have you Googling like mad.

Elizabeth Mitchell + Prince = Wes Bentley in 'Hunger Games'

Brittany Snow + Baby Sinclair from 'Dinosaurs' = Reese Witherspoon

Ashton Kutcher + Carrot Top = Kyle Korver

Carla Gugino + Kirby = Christine O'Donnell

Anthony Kiedis + The Incredible Hulk = Carlos Tevez

Weird Al Yankovic + Digital Underground = Redfoo from LMFAO

Reba McEntire + Andy Dick = Kathy Griffin

Jennie Finch + BJ Novak = Kaitlin Olson

Chris Brown + Puss in Boots = Shannon Brown

Wood Harris + Miss J = Tyler The Creator