International development secretary Justine Greening has announced she is in a relationship with a woman, in a tweet sent during Pride celebrations.
Greening, who campaigned for a Remain vote in the EU referendum, becomes the second openly LGBT member of the cabinet, after Scottish secretary David Mundell announced he was gay in January.
Congratulations poured in for the Tory MP for Putney from her cabinet colleagues, and across the political spectrum.
Scottish Labour leader Kezia Dugdale, and SNP MP Hannah Bardell, who both came out earlier this year, congratulated Greening.
While chancellor George Osborne said it was the "best news in last 48 hours" after Britain voted to leave the EU.