Well, that's not a good start to a show.
RiRi did not give the crowd an explanation for her tardiness, but did say that it took her a "long time to get back to Australia."
"Adelaide, what the f--k, I'm finally here," the 25-year-old singer said to her fans. "And I now remember how crazy my Australian fans are," she continued.
The Barbadian singer showed no signs of trouble at the show, tweeting post-performance "#ADELAIDE Thank you so much!!!"
But some fans weren't as forgiving on Twitter.
"TBomb_Moritz said.thanks for a disappointing show last night..as if doesnt suck enough already ," @
"petstarr joked.I auditioned for X Factor, won it, became a pop star myself and turned up late to my own concert," @
Next stop on the Diamonds World Tour: Brisbane on Saturday, Sept. 28. Better show up on time, RiRi!