First spouses...including Michelle Obama, Sarah Brown and Carla Bruni Sarkozy
They are an eclectic bunch: An ex- actress who hung out with Tom Cruise in a 'previous life', an ex-girlfriend of a Rolling Stone and a keen motorcylist.
Not easy, perhaps, to keep them all entertained. But Michelle Obama, their host, has a list of events to keep the G20 First Spouses busy in Pittsburgh.
While G20 leaders talk shop their wives will be entertained by cellist Yo-Yo Ma and country singer Trisha Yearwood.
Later, an Andy Warhol time capsule will be opened in their presence.
The spouses of the G20 leaders are not short of qualifications or achievements.
Sarah Brown ran her own public relations company and Michelle Obama - a self proclaimed "statistical oddity" - grew up on the South Side of Chicago and studied law at Princeton and Harvard.
A hand of friendship to Mrs Bruni Sarkozy
Some are more offbeat - Miyuki Hatoyama, wife of Yukio, the newly elected Japanese prime minister has already made it into Time magazine's top ten list of colourful First Spouses.
She has recently written a book in which she revealed that her soul has travelled via UFO to Venus, which she said is "an extremely beautiful place". She has also reportedly hung out with Tom Cruise - not recently, but in a previous life, when the Hollywood actor was Japanese.
Others have more conventional biographies. Laureen Harper, the wife of Stephen, the Canadian Prime Minister, once worked as a graphic artist and offers her home to the Ottawa SPCA as a foster home for kittens. She also, her husband's website says, enjoys riding her motorcycle.
Carla Bruni Sarkozy needs no introduction; the wife of the French president is a pop singer, internationally famous model and a former girlfriend of Mick Jagger.
Already, they have received welcome gifts from Mrs Obama - a porcelain tea set, a honey vase and a jar of honey.
The purple and platinum design of the tea cups is inspired by the gold and purple china that President Lincoln and his wife used. The honey is from the White House's first beehive.
Mrs Hatoyama touches down in Pittsburgh
On Thursday, they enjoyed dinner at Rosemont Farm, a working farm that raises live stock and produces fruits and vegetables, owned by Teresa Heinz, the millionaire philanthropist and wife of John Kerry, a former Democratic Presidential candidate.
Lets rock and roll
Any of the First Spouses harbouring rock star ambitions - step forward, Mrs Bruni Sarkozy - will enjoy the trip to Pittsburgh Creative and Performing Arts School for a tour and performance with students and music masters.
The spouses will drop in on a student orchestra performance and a rehearsal of Les Miserables, the classic musical.
They will then attend a performance by artists including Yo-Yo Ma, the cellist, and Trisha Yearwood, one of the biggest selling artists in the history of country music.
Her most recent album is "Heaven, heartache and the power of love", a title which may have some resonance for women trekking around the globe in their partners' shadows. Top ten hits include "She's in love with the boy" and " How do I live".
Fifteen minutes of art
No tour of Pittsburgh would be complete without a visit to the Andy Warhol museum. The artist was born and raised in the city.
Spouses will have the chance to silk screen one of Andy Warhol's images of a flower onto a tote bag that they then get to take home.
The artist, who famously said that everyone would enjoy fifteen minutes of fame, also stored 600 time capsules, each containing a variety of items.
As the day draws to a close and their husbands tweak the details of their communique, the First Spouses will get to witness their own bit of history - "the opening of one of Andy Warhol's heretofore sealed Time Capsules".