Jeffrey Donaldson has been elected as the new leader of the DUP in Westminster.
Mr Donaldson will take over from Nigel Dodds who lost his seat in the House of Commons following last week's General Election in the UK.
He was replaced by Sinn Féin's John Finucane in the north Belfast constituency.
Sammy Wilson was also elected as Chief Whip following a meeting of the DUP Parliamentary Party in Westminster this evening.
Mr Donaldson said that Mr Dodds had led the party in the UK parliament "very ably over recent years".
He said: "As someone who commanded respect right across the House of Commons he will be missed not just by DUP MPs but across all parties.
He said he was delighted to have been elected as Mr Dodds' replacement and that the focus the newly-elected parliament would "undoubtedly" be on Brexit.
Mr Donaldson added: "We will continue to seek change to that deal and work with the Government to deliver on their promise that Northern Ireland’s economic and constitutional integrity will be protected as the United Kingdom leaves the European Union.”
DUP leader Arlene Foster congratulated Mr Donaldson and Mr Wilson on their new roles.
She also said she wanted to see a functioning Stormont Assembly once again.
Ms Foster said: "Northern Ireland needs a strong team of MPs at Westminster, but to deliver fully for all our citizens I want to see a functioning Assembly and Executive working alongside our representatives in Parliament.
"The DUP will continue to focus on the issues which matter to all our citizens both in Westminster and at the Assembly.
She concluded: "We want to get Northern Ireland moving again with decisions taken on our schools and hospitals.”