Queen floats the Middletons' boat on her big weekend21 MAY 2012
The Duchess of Cambridge has been an integral part of the winning team that the Queen has put together for her Diamond Jubilee celebrations.
She had the crowds in Leicester eating out of her hand and was a charming addition to the guest list at the monarch's lunch for kings and queens at Windsor Castle.
And now her granddamother-in-law has gone one step further and invited her parents to take part as well.
On June 3, Michael and Carole Middleton will hop aboard the Elizabethan – a replica of a vintage 1890s Mississippi paddle steamer.
And reports suggest that their other children, Pippa and James, may also be present.
They will join members of the royal family as they take part in a 1000-boat flotilla that glides along the Thames.
Meanwhile, their daughter Kate and son-in-law Prince William will ride alongside Her Majesty on the sumptuous royal barge, Spirit of Chartwell, pictured below.
The surprise invitation is an indicator of how highly the Queen regards her grandson's wife.
"Michael and Carole's inclusion on the Elizabethan has only just emerged and has taken a lot of people by surprise, but the Queen is incredibly supportive of the Duchess and her family," an insider told the Daily Mail.
"Boats travelling in the Royal Squadron are solely reserved for special guests of the Queen, which demonstrates just how far the Middletons have come."
It won't be the first time the Sovereign has welcomed Kate's parents into her inner circle.
In June 2011, the Middletons joined her during the traditional Ascot carriage procession.
And shortly before the royal wedding, the Queen enjoyed a spot of lunch with the people who would become Prince William's in-laws.