Don't do it! These celebrity couples should never, ever get back together.
Justin Bieber and Selena Gomez
Enough already! They've tried it once, twice... three dozen times. It's clear at this point that Justin Bieber and Selena Gomez are better off as friends.
Khloe Kardashian and Lamar Odom
Yes, they are divorced. But the paperwork isn't signed. Sources claim Khloe isn't totally over Lamar, despite his infidelity and his drug use.
Pamela Anderson and Rick Salomon
They have been married and divorced THREE times. The fourth will not be the charm.
Rihanna and Chris Brown
Even after Chris Brown bloodied her face, Rihanna could not quit the singer. Let's hope - nay, pray! - that she finally has.
Juan Pablo Galavis and Nikki Ferrell
No, these two Bachelor stars getting back together would not be OK.
Jake Gyllenhaal and Taylor Swift
We could probably insert any of Taylor Swift's famous exes in here, but considering how private Gyllenhaal seems to be and how public Swift often goes with her break-ups, we're not sure how this relationship ever worked.
Kristen Stewart and Robert Pattinson
Don't hate on us, Robsten shippers. But if this relationship was going to work out, wouldn't it have worked out already? She did cheat on him, remember.
Charlie Sheen and Brooke Mueller
Charlie Sheen and Brooke Mueller were a destructive force together. Yes, they share children. But they also share some major issues.