EXCLUSIVE
Keyshawn Johnson has been arrested for domestic violence ... TMZ Sports has learned.
The former NFL star wide receiver was busted in Calabasas, CA early Monday morning.
According to law enforcement ... Keyshawn was involved in a fight with his ex-girlfriend when things allegedly got physical. Sources say he smashed her phone, causing a gash to her hand.
Our sources say the two had an up-and-down relationship and were arguing over marriage.
Johnson was formally arrested for misdemeanor domestic battery and booked.
Bail was set at 20K. Keyshawn made bail and is now out.
Interestingly ... Johnson was a loud complainer when Justin Bieber lived in his neighborhood ... once almost coming to blows with the singer's bodyguards.
