From the Other Woman to always and forever, a surprising number of current celebrity wives were mere mistresses first.
Check out some of the most noteworthy examples here ...
Angelina Jolie has wrecked not one but TWO marriages. Billy Bob Thornton was married when the two got together and then Brad Pitt, her costar on Mr. & Mrs. Smith, dumped wife Jennifer Aniston for her.
Tori Spelling hooked up with Dean McDermott while he was still married. And then she was shocked that he cheated on her...
There was no keeping LeAnn Rimes' relationship with Eddie Cibrian out of the tabloids since they got together while his wife Brandi Glanville was filming The Real Housewives of Beverly Hills.
Yep. Britney Spears is a homewrecker. Kevin Federline was with Shar Jackson, the mother of his first two children, when he met Brit Brit.
Brittany Kerr, NBA cheerleader and American Idol contestant, married country star Jason Aldean ... a few years after they were spotted hooking up at a bar while he was still married to his first wife Jessica.
Johnny Depp was with Vanessa Paradis for 14 years VOWING never to marry. Just a year into Amber Heard entering the picture and Depp hooking up with her, he walked down the aisle with the much younger actress.
Soon-Yi Previn might be the most infamous mistress ever. Woody Allen was her sort-of stepdad and married to her adoptive mother Mia Farrow when their relationship was discovered.
Camilla, Duchess of Cornwall
No THIS is the most infamous mistress ever: Camilla, the Duchess of Cornwall, was the very, very public mistress of Prince Charles while he was married to Diana. The two married in 2005 after Diana's untimely death.
Yep! Alicia Keys was a mistress before she became Swizz Beats baby mama.
When Jennifer Lopez started dating Skeletor (Marc Anthony), he was still married to Miss Universe.
Traci Lynn Johnson
Tiki Barber left his wife, who was pregnant with TWINS, for Traci Lynn Johnson.
Melanie Griffith and Antonio Banderas were BOTH married to other people when they got together in 1995. While there are reports he's still a cheather, they're still married almost 20 years later.
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.