Theresa Villiers will remain as Secretary of State for Northern Ireland following last week's UK General Election.
British Prime Minister David Cameron announced the re-appointment of Ms Villiers on Twitter as he tweeted his ministerial appointments for his new majority government.
It is the first time Mr Cameron has had the opportunity to appoint a Tory-only cabinet.
Ms Villiers has said it is time to get on with the implementation of the Stormont House Agreement.
She has pledged to devolve powers over corporation tax from London to Belfast if the deal is adhered to.
Negotiations are due to take place following the elections after Sinn Féin said it would not implement welfare reform.
This morning Mr Cameron announced that Boris Johnson has been appointed a seat at the cabinet.
However Mr Cameron has said Mr Johnson, the man once touted as a possible Tory leader, will not hold a portfolio so that he may concentrate fully on his role as Mayor of London, which ends in May 2016.
The issue of Britain's EU membership is also high on the agenda as Mr Cameron establishes his new cabinet.
Mr Cameron spoke to some European leaders over the weekend, following his promise of a referendum on Europe by the end of 2017.
Meanwhile, the DUP has reshuffled their Stormont ministerial team.
Arlene Foster, 44, is moving from the Department of Enterprise and Trade to take over as Minister for Finance from Simon Hamilton.
Mr Hamilton will be moving to take charge of the Health portfolio, where Jim Wells resigned recently for personal reasons.
Mr Wells' resignation followed a public outcry over comments allegedly linking gay marriage to child abuse. He later apologised.
Mr Wells announced his resignation two weeks ago saying he wanted to devote more time to caring for his wife who had suffered two strokes.
He had been facing calls to resign since the release of video footage in which he said the "facts show you certainly don't bring a child up in a homosexual relationship".
An alleged verbal altercation with a lesbian couple during an election canvass in his South Down constituency added further pressure.
Johnny Bell, an unsuccessful DUP candidate in the recent Westminister elections, is promoted from a junior ministerial role to take over at the Department of Enterprise and Trade.
One of the first challenges facing Ms Foster in her new role as will be the search for a compromise on budget proposals, currently stalled because of a disagreement about the scale of welfare reforms.
The new DUP Ministerial team. #DUPreshuffle pic.twitter.com/qgjjzL2xy4
— DUP (@duponline) May 11, 2015