She returned to the prime minister's residence at 10 Downing Street and made a short, grim-faced statement saying that she would form a government "that can provide certainty and lead Britain forward at this critical time for this country".
Theresa May has said sorry to the Tory MPs and ministers who lost their seats due to her decision of holding elections.
The spokesman indicated this would not be a formal coalition but a minority government with looser DUP support on a "confidence and supply basis".
In March, a snap election was called in a bid to elect a new government willing to return to government, however the same parties were returned following the poll.
Ironically, the Prime Minister is the one political leader who understands this division, and who has been working to address it since she became Prime Minister last July.
They have repeatedly blocked any attempts to extend Northern Ireland's drastically limited abortion rights, and as recently as previous year, Foster was quoted as saying "I would not want abortion to be as freely available here as it is in England, and don't support the extension of the 1967 act, ' which legalised abortion by recognised practitioners in the United Kingdom".
The stunning election result comes after a campaign in which May lost popularity over her style and some of her social care policies, including a so-called "dementia tax" that would force the elderly to pay more for their care.
This includes Philip Hammond who stays as Chancellor of the Exchequer, Amber Rudd who stays as Home Secretary and Boris Johnson remaining as Foreign Secretary.
Outside the Downing Street gates, anti-DUP protesters chanted "Tories out, refugees in" and "Tories out, Corbyn in", as a petition against a deal between the two parties topped 500,000 signatures in just 12 hours.More news: Apple reportedly adds simple Wi-Fi sharing in iOS 11
Mr Corbyn, whose Labour party won 262 seats in the election, told the Sunday Mirror he would oppose the Queen's Speech all the way.
Prime Minister Theresa May thought she'd sweep elections with a broad mandate to run the exit negotiations with the European Union, but didn't work out that way.
Former minister Anna Soubry said Mrs May should "consider her position" after a "dreadful campaign" while backbencher Heidi Allen suggested she could be out within a matter of months, depending on the Brexit negotiations. "That's not a matter for me", she said.
EU Council President Donald Tusk says that Britain should look to start discussions to leave the European Union as soon as possible or it risks crashing out of the bloc with no deal.
"This government will guide the country through the crucial Brexit talks that begin in just 10 days and deliver on the will of the British people by taking the United Kingdom out of the EU". Nonetheless, she's back at Number 10.
It's relatively unlikely the DUP will end up holding substantial sway for long, given the inherent instability of the planned arrangement and the fact it may violate the peace agreement that ended the decades of conflict in Northern Ireland.
They said that for two years he was attacked by media but tens of thousands of youth voted for him because he offers genuine change.
A BBC projection put the Tories on 43% overall - about six points up on David Cameron's result in 2015 - and Labour on 40%, outpolling Ed Miliband and Gordon Brown's results and even racking up more votes than Tony Blair did when he won power in 2005. This makes them the biggest anti-abortion party in the country.