Ant McPartlin has been released under investigation following his arrest on suspicion of drink driving on Sunday.
The 42-year-old TV star is said to have been involved in a collision with two other cars while he was driving his Mini in Richmond, West London, on Sunday afternoon.
Police said a child passenger from one of the cars was taken to hospital to be checked as a precaution.
A Metropolitan Police spokeswoman said McPartlin was "taken to a south London police station for questioning and has since been released under investigation."
Earlier, a Metropolitan Police spokesperson said: "Police in Richmond were called to Lower Richmond Road, SW14 at 15:59hrs on Sunday, 18 March following reports of a road traffic collision involving three vehicles.
"Officers, London Ambulance Service and London Fire Brigade attended.
"A number of individuals were treated at the scene for minor injuries only. A child passenger from one of the cars has been taken to hospital for a check up as a precaution.
"A 42-year-old man was arrested at the scene on suspicion of drink-driving after failing a roadside breathalyser test."
McPartlin co-hosts a number of ITV shows alongside Declan Donnelly, including Ant and Dec's Saturday Night Takeaway, Britain's Got Talent and I'm A Celebrity.
His arrest is the latest in a string of personal setbacks for the star.
He entered rehab last year after struggling with an addiction to painkillers following a knee operation in 2015 and in January McPartlin confirmed that he and his wife Lisa were separating after 11 years of marriage.
Following McPartlin's arrest, there have been questions about whether Ant and Dec's Saturday Night Takeaway will air as normal this weekend.
ITV has yet to comment on the programme, which is scheduled to air live on Saturday at 7pm.