The prime minister's three-day trade mission also takes in Nigeria and Kenya, and it's clear its aimed at boosting economic ties with Africa ahead of Britain's planned exit from the European Union in March 2019. Mrs.
She will announce an "ambitious new approach" to the UK's aid spending in Africa, by using it to help British private sector companies invest on the continent.
People were quick to scrutinise Mrs May's quirky boogying on Twitter after footage emerged online.
Britain was South Africa's 6th largest global trading partner a year ago, with total trade at 79.5 billion rand ($5.6 billion), the South African president's office said.
Theresa May is preparing to visit Africa for the first time since becoming prime minister in 2016.
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Britain's overseas aid previous year was 13.9 billion pounds ($18 billion).
After a bilateral meeting with South African president Cyril Ramaphosa, in which Zimbabwe is likely to feature, the PM is also expected to visit Robben Island.
Former foreign minister Boris Johnson, whose July departure from the cabinet brought May's government to the brink, said in his resignation speech that May's current Brexit policy would hamper London's ability to strike independent trade deals.
'That's why I'm delighted that we will today confirm plans to carry over the European Union's Economic Partnership Agreement with the Southern African Customs Union and Mozambique once the EU's deal no longer applies to the United Kingdom'.
In her tour to Africa, the UK Prime Minister will be joined by a business delegation made up of 29 representatives from UK business - half of which are SMEs - from across all regions of the UK and its devolved administrations.
"That bill will give more clarity on how South Africans should deal with the land question and the property issues that today still favour the minority at the expense of the majority of South Africans, in particular black people".