Catriona Stewart's verdict: four stars

YOU have to wonder what their mothers think of these crotch-grabbing, liberated, commanding young women.

Rihanna, dressed like a golden, gansta tiger, is 20 minutes late on stage - practically early by her standards - and grinding and winding like her bones are entirely marrow.

She is surprisingly beautiful, this 25-year-old, with the fine featured face of a 40s film star and the ability to turn it from coquettish to lascivious in turns.

She opens with an attitude laden Phresh Out the Runway before Birthday Cake. She is a girl you would want on your side in a fight.

You Da One melts her hard edges before Man Down, a song that never fails to be tainted with the knowledge of her real life relationship travails; the song details her shooting a man who hurts her.

The fun truly begins with Rude Boy and What's My Name. Laden with suggestion and ever flirtatious, she invites us to ride her pony and go downtown.

Although the sun abandoned Balado hours before and the night air is thin and icy, Rihanna brings heat to the huge crowd gathered before her.

She writhes through a greatest hits list - until it comes to a perfunctory Umbrella, a song she injects with barely any energy, as though she can't wait for it to be over.

It ends, she whispers a quiet "thank you" and normal business quickly resumes with All Of the Lights. 

Then the limber backing dancers leave her alone on stage and Rihanna prepares for What Now?

"We all know love can be complicated," she prefaces the song. Take A Bow, next up, is even more painful and, at the line "You look so ugly when you cry" the singer wells up, or affects to.

Who knows what is sentiment and what stagecraft, but it's a nice little nuance in an otherwise bombastic set.  

Diamonds, Only Girl, Don't Stop the Music and Where Have You Been bring her fully to life.

The stage darkens and it seems the show is over but then back she comes for a lovely rendition of Stay before Diamonds again.

As she turns to walk off the stage, fireworks explode over the arena and it's hard to know which way to look.