Rihanna is on a bit of a roll at the moment following her BDOTW win.

The singer was in London to attend the Stella McCartney special presentation during Fall 2012 London Fashion Week on Saturday.

She looked outstanding once again wearing a sexy forest-green custom Giorgio Armani gown.

Her spaghetti-strap gown with a plunging v-neck, open back and thigh-high split was teamed with gold Tom Ford python heels.

The rest of her accessories included Susan Caplan vintage gold chokers and bracelets plus Annoushka diamond rings.

Love or hate her hair, she just oozes sex appeal, as this collabo with Armani is really working wonders for her.

To the 2012 Grammys she wore her hair curled, but on this occasion she opted for straight silky locks.

I wonder how Stella felt about her guest of honour wearing a dress by a different designer?

Credit: Getty