On Monday, Delevingne attended the London premiere of Valerian and the City of a Thousand Planets with her costar Rihanna. Though both women looked stunning — Us Weekly reports RiRi wore a Giambattista Valli gown and Delevingne wore a Burberry jumpsuit — it wasn't the haute couture people found themselves checking out. Instead, fans were transfixed by a photo of Delevingne checking out Rihanna's cleavage, which they quickly turned into a meme.