TV star Ant McPartlin has been arrested on suspicion of drink driving, according to reports.
The 42-year-old is said to have been involved in a collision with two other cars while driving his Mini in Richmond, west London, just before 4pm on Sunday.
A child passenger in one of the cars was taken to hospital for checks, as a precaution.
Others involved were treated at the scene for minor injuries.
McPartlin failed a roadside breath test and was arrested.
He had been with his mother at the time, according to The Sun.
A Met Police spokesman said a 42-year-old man had been taken to a south London police station for questioning and enquiries continue.