Rihanna: Mahiki with Melissa!

Rihanna and her BFF Melissa head home after partying the night away at Mahiki nightclub in London on Tuesday night (May 11).

The 22-year-old Bajan babe recently sent British singing sensation Pixie Lott a bouquet of flowers (Pixie opened for Ri at the LG Arena in Birmingham on Friday).

On Thursday, Rihanna will headline another concert at the Sheffield Arena with Pixie opening once again!

FYI: RiRi is wearing an A.L.C. nude bandage skirt!

10+ pictures inside of Rihanna hitting up Mahiki with Melissa…