The singer was unbelievably stunning in her flowing, scarlet Azzedine Alaia gown, with its long train and ethereal simplicity.
The star, who usually loves piling on the accessories, kept it really simple and sophisticated in a Neil Lane cuff and ring combo, and her loose flowing curls and red lip were the perfect hair and makeup accompaniments.
But, of course, this is Rihanna, and there was a little hint at sexiness with a peekaboo feature around the waist and pretty diaphanous criss-cross bustline.
One of our favourite Rihanna looks ever? Hell, yeah.
Meanwhile, the Rihanna and Chris Brown show couldn't have been more different to the unfortunate events back in 2009. See their loved-up pics here:
See all the stars and style at the 2013 Grammys here: