Professor Green has been arrested on suspicion of drink-driving after police were called to reports of a robbery.
The rapper, whose real name is Stephen Manderson, was questioned at a police station on Sunday and was released on bail until later this month.
Officers had been called about a suspected mugging in south London at about 2.40am.
When they arrived they found that Professor Green's car had been involved in a crash with a van.
A Scotland Yard spokeswoman said: "Inquiries into the circumstances of the robbery and collision are ongoing."
Professor Green recently married Millie Mackintosh, star of reality TV show Made in Chelsea.
Earlier this year he was involved in a car accident.
He said it left his health and album/touring schedule "in absolute jeopardy".
His Are You Getting Enough tour was originally due to take place this month but had to be postponed because he said he needed more time to work on material for his third studio album.
The dates have been rescheduled for May 2014.
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