We're told Lamar was driving home from a friend's place in Northridge when he dropped his phone inside his Mercedes, reached down to retrieve it, lost control and smashed into a pair of cars parked on the street.
Lamar's rep says his white Mercedes hit another white car, which bumped into another car parked in front of it.
Lamar's airbags deployed, and he wasn't injured and didn't need medical assistance ... though he was a little shaken up and his Mercedes is now mangled.
Cops were called but LAPD did not take a police report after responding to the scene. We're told officers spoke with Lamar, asking him if he had been drinking, to which Lamar said no and told cops about being sober and owning rehab facilities.