Liz Truss, Boris Johnson, Theresa May, David Cameron, Gordon Brown, Sir Tony Blair and Sir John Major arrived at the ceremony together.
Yep, our shortest ever serving PM, was there in all her pomp.
She is also heading to Taiwan this week to create worse relations with China, but we will get to that in a minute.
Mr Johnson and his wife Carrie, who left No 10 less than a year ago, followed in the procession of former PMs.
This is funny…
Before we get to the jokes, Liz Truss is on her way to cause trouble with the Chinese. Big trouble in little serving PM, could be the name of the post-apocalyptic world.
The UK’s shortest-serving prime minister has been giving speeches around the world about the importance of democracy in the face of increasing Chinese power, with Taiwan next on her list.
Ahead of her visit next week, she said: “Taiwan is a beacon of freedom and democracy.
“I’m looking forward to showing solidarity with the Taiwanese people in person in the face of increasingly aggressive behaviour and rhetoric from the regime in Beijing.”
When the US House speaker, Nancy Pelosi, visited Taiwan last year, China claimed it had put its army on “high alert” and announced targeted military operations including missile tests.
Oh why not…
Oh and she used to want them to be abolished.