Joaquin Phoenix in LA car crash

Actor Joaquin Phoenix was involved in a car accident in the Hollywood Hills earlier today. ''His brakes went out and the car flipped over,'' the actor's publicist, Susan Patricola, tells Us. ''But he's doing fine. He may be very sore in the morning, but right now he is doing okay.''

Phoenix was driving eastbound on Lookout Mountain Avenue near Laurel Canyon Boulevard about 2:50 p.m. when he realized his brakes were not working, said Officer Jason Lee, a police spokesman.

Phoenix lost control of his car, which overturned and hit another vehicle also headed eastbound, Lee said.

Although the exact circumstances of the accident remain under investigation, his representative says the 31-year-old star was driving the car at the time. The Golden Globe winner was not hospitalized, according to his publicist.

Phoenix, whose older brother River died at age 23 from a drug overdose in 1993 outside the Viper Room on Sunset Boulevard, has earned critical acclaim for his portrayal of the late Johnny Cash in last year's Walk the Line, costarring Reese Witherspoon.