Wendi Deng is perhaps best known in Britain for defending husband Rupert during a physical attack at a parliamentary hearing in 2011.
The Chinese-born businesswoman was seen landing a slap on the face of activist Johnnie Marbles, who had attempted to throw a foam pie at Mr Murdoch.
More top news
Wet weather is expected across most of the UK later as rain sweeps in from the west overnight.
Spoiler alert: This year's Apprentice finalists have been chosen after escaping Lord Sugar's contestant cull.
Cult internet star The Wealdstone Raider has thrown his football shirt into the ring in the battle for 2014's Official Christmas Number 1.