Though not modeling as she did last year for the duo’s debut, Lady Gaga remains a presence at Mugler, this time rapping on a soundtrack of her new single “Cake.” Graphic shapes and lacquered leggings ensure the collection still has a sci-fi bent. But Nicola Formichetti and Sebastien Peigné injected a new softness with skirts that folded back in on themselves and dresses with quirky peplum hems. A new collection of rigid leather bags hits stores in January.