Kristen speculation. I believe her Balenciaga dress is custom since she arrived in France earlier and stayed for a bit. She even shot Vanity Fair with Karl Lagerfeld wearing a lot of Chanel but kept her Balenciaga around..
I heard that Beyoncé is going with Solange, can't fully confirm though. Same goes for J-Lo.
Just as long as Beyonce doesn't come looking a mannequin fool.
Last year she tried to look couture and failed miserably.
And J.Lo looked like a purple toucan.