Younger sibling Khalif Brown sways in woozily, living up to his nickname, Swae Lee, a cluster of diamante-rimmed pendants clanking around his slender frame. The Mississippi brothers have an image of being hip-hop’s hard-partying, swag-bragging, enfant terribles, and – true to form – they are worse for wear today, following a big night out in Paris. You could never say that Rae Sremmurd can’t stay in character.