While mother-of-two Kim, 35, was glammed up to the nines in a skin-tight dress and boots, model Kendall, 20, was super casual in ripped jeans and a simple white T-shirt.
The pair were pictured power walking out of their hotel on Monday (23 May), sporting matching sunglasses and rather serious looks.
Kim's just back in London after a whirlwind trip to Rome last night, where she attended the La Traviata Gala Preview at Teatro Dell'Opera. She flew to Italy from London, where she'd taken part in a panel discussion at The Vogue 100 Festival on Saturday.
Kendall, meanwhile, has flown in from Cannes, where she was a major figure on the Film Festival party circuit and red carpets over the past two weeks.