The former civil servant will officially enter the unelected chamber four months after she was forced out as Sir Keir Starmer 's chief of staff in Downing Street .
The Buckingham Palace reception was held by King Charles and Queen Camilla to welcome new Members of Parliament and Members of the House of Lords on January 29.
The Prime Minister is set to appoint Sue Gray as a Labour peer in the house of Lords, as part of a cohort of around 30 of his allies despite plans to cut the chamber.