It's not pretty when Tiger Woods' mistresses clash.

Devon James, the [expletive] star who claims to have carried on a torrid affair with Tiger Woods, has threatened to kill in a feud with another of the philandering golf star's alleged mistresses, Breaking Celebrity News has exclusively learned.

In an email sent to a mutual friend, Devon spewed hatred and violent threats toward Joslyn James, who is also a [expletive] star, even suggesting her broken heart at the hands of Tiger resembled "her botched [expletive]."