The Sun reported that Ant was dining with mother Christine and his aunt when a gang of men started banging on the window and filming the TV presenter.
The 38-year-old then reportedly went outside to ask them to stop when he was grabbed around the head by one of the yobs.
When 58-year-old Christine intervened, she was pushed over by one of the gang members.
A witness said: ‘The youths were banging on the window, filming them and generally being a pain — and they just wouldn’t let it lie.’
‘Ant was completely reasonable and said, “Leave it out, lads, I’m just having a quiet meal.’
They continued: ‘But it immediately turned really nasty and one of them jumped on him and put him in a head-lock.’
A spokesperson for Scotland Yard revealed: ‘At 8.13pm on Thursday March 13 there were reports of an assault in Spencer Road, Chiswick.’
‘Police attended but no allegation was made and no one suffered any notable injuries.’
According to reports, the gang had already fled by the time police arrived.