Schools minister and South West Norfolk Liz Truss was the second female MP to arrive at Downing Street on Tuesday morning as the Prime Minister's reshuffle continues.
She was be promoted to the Cabinet after just four years an MP and is the Environment Secretary.
Ms Truss followed Women's minister Nicky Morgan who replaced Michael Gove as Education Secretary.
Andrew Lansley leaves the top table of politics after a decade by leaving the Cabinet and announcing he will step down as an MP next year.
David Cameron has carried out the biggest wholesale shake-up of his ministerial team since becoming Prime Minister.
Liz Truss is one of the fastest-rising stars of the 2010 intake of Conservative MPs, reaching the Cabinet at the age of just 38.