The 22-year-old heartthrob bought the roses from a vendor and then passed them out to the girls who were waiting to enter the Tape Night Club in the city.
And he didn't let his security detail stop him from having a good time and talking to the women, reported Contactmusic.
Bieber is in London for performances at the O2 Arena as part of his Purpose world tour.
He is happy to be there, judging from his tweets - he wrote, "Great night. See you again tomorrow London.
Disclaimer: No Business Standard Journalist was involved in creation of this content