The Prime Minister arrived in Belleek, county Fermanagh for her first engagement in a two-day visit to Northern Ireland.
It's Theresa May's first trip to the border since the Brexit referendum two years ago.
She met with business leaders to hear their views on brexit - people that live, trade and work on the border.
"She'll hear views from people who live in Fermanagh on the border, she'll hear people who work across the border and I hope that she'll be engaging with those people in a very meaningful way," said Ms Foster.
The Prime Minister will also meet with other political parties here to discuss restoring devolution to Northern Ireland.
However Sinn Fein, the SDLP, Alliance and the Green Party all signed a joint letter this morning saying they had significant concerns about the progression of brexit negotiations.
Tomorrow morning the Prime Minister will have further meetings with the political parties and will speak with young people here to hear their views on the future of Northern Ireland.
Before returning to London, Theresa May will deliver a key note speech in Belfast on Friday.