Russell Brand's Secret Weapon -- Katy Perry's Skirt 
 
 isn't making it up ... law enforcement sources tell TMZtold LAX cops immediately after he attacked paparazzi that he did it because a photog was trying to shoot up his fiancée's skirt.As we first reported, Brand and Perry were going through Delta security when he allegedly attacked photogs . He was arrested for misdemeanor battery.In addition to telling cops about the upskirt shot, we're told Brand and his lawyer raised the issue at LAPD's Pacific Division, where Brand was booked.Katy herself tweeted, "If you cross the line & try an put a lens up my dress, my fiancé will do his job & protect me.
– Russell Brand is free on bail today on charges of simple battery after he allegedly roughed up members of the paparazzi at LAX airport. The reason? He told cops upon his arrest that photographers were trying to shoot up fiancée Katy Perry's skirt, reports TMZ. Katy herself confirms the line of defense, via tweet, of course: "If you cross the line & try and put a lens up my dress, my fiancé will do his job & protect me." MTV has more details.