Queen Elizabeth has confirmed Theresa May as Britain's prime minister and invited her to form a new government, after she accepted the resignation of David Cameron at Buckingham palace Wednesday.
The 59-year-old May is expected to unveil the new Cabinet lineup, including a minister in charge of implementing Britain's exit from the EU, possibly as early as this evening.
In her first speech as prime minster, May says she plans to lead in the spirit of unity and build a country that ``works for everyone.'' She said she would fight against social injustice and that she believes in the unity of all aspects of Britain.
Although May, former Home Secretary in Cameron's cabinet, supported Britain staying in the bloc, she said earlier this week that "Brexit means Brexit," but stressed the need "to negotiate the best deal for Britain in leaving the EU."
May, the second British woman prime minister after Margaret Thatcher, has also said that she will not initiate the exit negotiations before the end of the year.
Before heading to the audience with the Queen, Cameron said outside prime minister's residence 10 Downing Street - that is was the ``greatest honor'' of his life to serve as prime minister. Surrounded by his wife and their three children, Cameron offered an assessment of his tenure saying he left the country stronger and better off.
WATCH: Cameron on his resignation
Cameron wished his successor luck in her negotiations to have Britain leave the European Union, the matter that forced him to leave the office.
Cameron made his final appearance in the House of Commons, earlier in the day, where he received a standing ovation for his performance after six years in the job.
The normally raucous prime minister's questions, turned into a friendly session Wednesday when Cameron was praised for helping to reduce unemployment, fund the National Health Service, and improve educational opportunities.
Cameron also gave all but a guarantee to European Union citizens living in Britain that they would not be forced to leave the country when Britain leaves the bloc.
He said the government is working hard "to do what we want, which is to give a guarantee to EU citizens that they will have their rights respected."
Cameron resigned after Britain's narrow vote in the referendum of June 23 to leave the EU. He had backed the "Remain" in the bloc campaign.