What: Both causing a flashbulb frenzy in very different LBDs. While Kourtney opted for buttoned-up high-neck, spotty tights and a severe chic bun, Kim flashed the flesh in a low-backed wet-look mini teamed with loose locks and strappy gold heels.
Where: Arriving at a party to celebrate the UK launch of the Kardashian Kollection, Aqua Club, London.
Verdict? We feel like we've seen this kind of look on Kim a hundred times before so, while she still looks good in it, we're crowning Kourtney style queen for adding a pop of personality to her look.
Do you agree? Let us know below, and see more from last night's launch party here: