Swatters strike again, costing L.A. taxpayers a pretty penny. Pranksters, if you can call 'em that, believed to be part of a hacker group, called 911, claiming that two armed men broke into Rihanna's Pacific Palisades mansion yesterday (April 4) and that someone was shot in the melee.

TMZ reports that none of it was true, but the authorities took the matter seriously and dispatched a SWAT unit to the residence to check things out.

Diddy was swatted earlier this week in the San Fernando Valley.

These calls surely add up on the taxpayer's dime, and we have to wonder if all this crying wolf will interfere with responses to actual, legit calls.

Recently, Miley Cyrus and Justin Bieber were also swatted. Swatting should not be confused with The Biebs' Spitgate; that was actually part of a real problem. Simon Cowell was also a victim of this type of prank.

The swatters are said to be related to the hacking team that has divulged the financial records of everyone from Beyonce to Britney Spears to Lady Gaga.

Celebs, their bank accounts and their homes are not safe from the hacking and swatting.

Watch the Rhanna 'Stay' Video