Russell Brand has just been arrested for allegedly attacking paparazzi at LAX airport ... TMZ has learned, and it was a citizen's arrest.
of another angle of the incident.
UPDATE 5:54 PM PT: Russell has posted $20,000 bail and has left the police station.
Around the same time, Katy defended Russell via Twitter, saying, "If you cross the line & try an put a lens up my dress, my fiancé will do his job & protect me."
The alleged upskirting is not seen in video of the incident.