Elizabeth Taylor's husband Richard Burton was mostly likely married when they started dating but we may never know for sure.
When Julia Roberts married her now-cameraman-husband, she pulled him away from his then-wife to do it.
So maybe this should be a picture of Jerry Seinfeld since HE broke up Jessica Sklar's first marriage just months after she returned from her honeymoon.
Ethan Hawke and Uma Thurman's marriage came to an end because of one Ryan Shawhughes. The actor is still married to the one-time nanny to his children.
Kelsey Grammar married Kayte Walsh just three weeks after the ink dried on his divorce decree from Camille Grammar.
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