Britney Spears‘ people are trying to bully the woman with whom her boyfriend cheated … by threatening she’s so rich and powerful she’ll destroy the woman if she blabs.

It’s pretty shocking … Britney’s legal team sent a nasty letter to Cali Lee … warning her that Brit’s former BF David Lucado signed a confidentiality agreement with Britney, and anything he told Cali during their affair must be kept secret.

Here’s the thing … it’s BS. Cali is NOT bound by some confidentiality agreement David signed. Period. And Cali’s lawyer has told his client she can say what she wants.

Read more at TMZ