Beyonce, Jay-Z, Mila Kunis, Ashton Kutcher, Prince William, Kate Middleton

Abaca/AKM-GSI;; Fame Pictures

What is the secret to lasting love between celebrity couples? Shared priorities? Shared interests? Or is it just shared clothes?

They say couples morph into the same person over the years, which appears to be the case for these look-alike A-listers. It's one thing to step out looking like a complete set, but for some of these duos, there's way too much of a twin thing going on!

Prince William and Kate Middleton both go royal in deep purple, Selena Gomez and Justin Bieber are strolling in matching polos, and then there are the two tux twins: Angelina Jolie and Brad Pitt and Justin Timberlake and Jessica Biel.

At some point the cute-factor just gets creepy! Click the images below to see which of our set falls into that category...

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