Justin Timberlake -- SWATTED

Justin Timberlake has just been swatted ... TMZ has learned.

The singer is the latest in a string of people to be victimized by someone calling 911 and falsely claiming there was violence occurring inside the celeb's house. Law enforcement sources tell TMZ ... the caller claimed 4 black males entered the house and 2 shots were fired and they left a box with red blinking lights.

TMZ broke the story ... Rihanna was swatted Thursday and the day before Diddy was hit.

As we reported, it appears the hackers who obtained financial information from a number of celebrities, including Michelle Obama and Kim Kardashian, are behind the latest swatting incidents.