Gwen Stefani
From left to right: Gwen Stefani wearing a black and white patterned tunic, and the Christian Dior Fall 2015 Collection.
From left to right: Gwen Stefani wearing cream trouser pants and shoulder pads, and the Alexander McQueen Fall 2015 Collection.
Christina Aguilera
From left to right: Christina Aguilera wearing a red body con dress on The Voice, and The Boss Fall 2015 Collection.
From left to right: Christina Aguilera wearing a printed max dress on The Voice, and the Emilio Pucci Fall 2015 Collection.
Pharrell Williams
From left to right: Pharrell wearing a plaid shirt, and the Alexander Wang Fall 2015 Collection.
From left to right: Pharrell wearing a red Adidas Jacket, and the Emilo Pucci Fall 2015 Collection.
Adam Levine
From left to right: Adam Levine wearing a blue suit on set of The Voice, and the Salvatore Ferragamo Fall 2015 Collection.
From left to right: Adam Levine wearing a denim jacket, and the Chloé Spring 2015 Collection.
Source: Style.com & Pinterest.com