Two identical pictures of the 'Diamonds' singer took over the capital landmark on Monday evening (9 September) as part of a publicity campaign for upcoming fragrance 'Rogue'.
Staying true to her love of revealing clothing, the images show RiRi wearing nothing but a pair of black underwear and black stilettos.
The pictures were taken before her recent hair change as she's sporting her old, long caramel locks rather than her new jet black mullet style.
'Rogue' is Rihanna's fourth fragrance and it officially launches on 24 October. However, lucky fans were able to get their hands on a bottle early when 100 were released online via Selfridges at 10am today.
Rihanna's 'Nude' fragrance was a winner in the Reveal Summer Beauty Awards 2013 so we're looking forward to a whiff of her latest effort.
While Rihanna's picture was being displayed to thousands of passersby in London, the lady herself was over in New York, where she was recently spotted at Fashion Week.
She's due in London soon, however, to promote her new River Island collection.
Rihanna's best bikini moments in pictures: