And that wedge's name is Chris Brown!
And now, with the growing romance between Breez and Rih, it seems like there's no hope for a bestie reconciliation, as an insider reveals:
"Katy was always the one person who could really stand up to Rihanna. When it comes to Chris, Rihanna isn't willing to listen. Katy is still incredibly angry about what Chris did, and she doesn't believe he can change."
Divulging even more hot deet, the source continues:
"She has stuck her neck out for Rihanna, and so it really hurt when Rihanna ignored her advice. Katy told Rihanna that she couldn't stick around and watch someone she loves make such a big mistake, and that she had to walk away. They haven't spoken for months. Chris is like Rihanna's addiction and no one can talk any sense into her."
We hate seeing such a great friendship crumble, but we know how devastating it is to watch a friend willingly walk into the lion's den too.
CLICK HERE to watch OUR open letter to RiRi!
You know… when saint John Mayer's not around. Or maybe even when he is! Ha! ;)
[Image via Adrianna M. Barraza/WENN.]