The Keeping Up With The Kardashians star, 17, was at Westfield in Shepherd's Bush for a promotional event and decided to hang around afterwards for some retail therapy.
Kylie started her day by attending a photocall at the shopping mall's Vue Cinema, announcing her as the new global ambassador for Nip + Fab skincare products,.
She caused a bit of a stir thanks to her risqué outfit which showed off her bra underneath a mesh top. Some commentators wondered if it was a bit much for a 17 year old…
Later in the day, she swapped into something far more comfortable to hit the shops: a grey knitted dress, knee high boots and a long brown coat.
She was pictured browsing the racks before heading back to her hotel.
While Kylie was in the UK, her family over in the States were busy whipping up a storm of excitement about the new series of Keeping up With The Kardashians, which began last night.
Series ten will cover storylines including Kourtney's pregnancy and the birth of son Reign Aston Disick and Kim's desire to have a second child.
Why is Kylie Jenner famous? Find out below!
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