Wendi Deng gained popularity for springing to her husband's aid when a protester threw a custard pie at him as he appeared before MPs to answer questions about phone hacking in 2011.
At 44, Ms Deng is 38 years younger than Mr Murdoch, who is 82.
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The singer ended speculation over who would perform by saying "the rumors are true" to her 63 million Twitter followers on Friday morning.
There will be lighter winds for all of us than yesterday, although it will still feel cool.
Senior fashion analyst at Mintel Tamara Sender said: "For the first time ever sales of trainers have overtaken high heels."