It looks like Rihanna may be losing fans Down Under, as the pop star was booed onstage after arriving one hour and 20 minutes late to her concert in Adelaide, The Australian reports, and this isn't the first time she's shown up and allegedly acted less than professional.

Fans of the singer vented their frustration on Twitter after Rihanna not only arrived fairly late to her scheduled 9 p.m. show, but offered nothing in the way of an apology of explanation.

"Adelaide what the f***...I'm finally here...and I now remember how crazy my Australian fans are," she said. While they were waiting, concertgoers took to social media to call out the pop star for her bad behavior.

"Thanks for a disappointing show last night... as if Adelaide doesn't suck enough already. #igotdressedforthat #late," one fan tweeted.

As they waited, the crowd had a dance-off and tried to create a giant Mexican wave, turning the stadium into their own concert as men took off their shirts and women danced and laughed, their antics displayed on the big screen in the absence of the main performer. When Rihanna finally did show up, she started off performing many of her lesser-known songs, though eventually sang her biggest hits for the very patient crowd.

"Well done @rihanna. You achieved the impossible & managed to make #Adelaide Metro look punctual," tweeted Katharine Nicholson.

This isn't the first time fans have criticized Rihanna for her tardiness and bad behavior on her "Diamonds World Tour." Just several days ago, the star showed up 40 minutes late to her concert in Perth, only performing one of her singles within the first set of 10 songs while slurring her words and overall seeming totally disinterested to be onstage, wrote a reviewer for the Sydney Morning Herald.

"Largely carried by her back-up singers and backing tracks, she danced across stage with or without her microphone at her mouth, to much the same effect," wrote reporter Jillian McHugh. "But when she changed gears from the reggae and kicked off a run of singles with 'Rude Boy', the change was palpable. Hands skyrocketed into the air and seated fans jumped to their feet."

And after a performance in Singapore earlier this week, fans on Twitter complained of the singer lip-synching, being "high on weed" and prompting much of the audience to leave early.

via OhNoTheyDidn't