The Man Down hitmaker was due on stage at 8.45pm for the first of three gigs at the Odyssey Arena, but didn't start her show until 10.15pm, according to the Belfast Telegraph.
The 23-year-old singer issued an apology on Twitter and said last minute preparations were to blame for the delay on the opening night of her three-month long European Loud tour.
She wrote: 'BELFAST sorry for being so late 2nt!BIG SHOW!FIRST NIGHT!Things dont always run smoothly or as planned,but I dearly appreciate ur patience.'
Rhi Rhi is due to play the Odyssey Arena again tonight and tomorrow.