Paris Hilton's boyfriend River Viiperi is facing battery charges over a lesbian kiss.
Hilton, who was partying with new beau River Viiperi at the Encore hotel's XS club, kissed a girl, infuriating Viiperi, according to TMZ.
Viiperi, a 21-year-old model, allegedly punched the other girl's boyfriend, who then reportedly needed medical attention.
A Las Vegas police spokesperson said "they had enough probable cause to believe a misdemeanor battery occurred."
Viiperi was then cited and released "in lieu of arrest," GossipCop reports