Sgt. Kyle Stjerne says the department received a call at about 10:30 a.m. Friday from London's girlfriend, alleging the actor assaulted her outside her Palm Springs home.
Stjerne says a verbal altercation over custody of the couple's child became violent and she suffered minor injuries. The woman's name wasn't released.
London's lawyer Catherine Lombardo denied allegations that the abuse occurred.
London's volatile relationship and addiction issues were broadcast to VH1 viewers during season four of the reality show "Celebrity Rehab" with Dr. Drew Pinsky.
London's most memorable performances include the slacker anti-hero lead role of TS Quint in "Mallrats" and roles on television's "7th Heaven" and "Party of Five."
