Ariana Grande parties at Cirque Le Soir is London, EN (06/01)

She entertained a sold out O2 Arena on Monday evening, but the night was still young for Ariana Grande as she partied into the early hours with close friend Niall Horan.

The 21-year-old singer ventured into central London shorty after performing for 20, 000 fans at the sprawling Greenwich venue – the first UK date on her The Honeymoon world tour.

Trading the sparkly minidress and glittering heels for a revealing crop top and pencil skirt, Ariana was in high spirits as she made an entrance at raunchy burlesque club Cirque Le Soir with a small entourage of pals.

The singer was later joined by Niall – currently enjoying the final flourishes of a protracted break before returning to the stage with of his One Direction band-mates for their third epic roadshow in as many years – the aptly titled One The Road… Again tour.

Niall, 21, looked stylish in skinny jeans and Chelsea boots for his appearance at the Ganton Street venue after arriving in the early hours.

The singer completed his ensemble with a black denim jacket and simple white T-shirt, while a raffish Baker boy hat rounded things off. Check out the photos + videos below!