Rihanna went to support A$AP Rocky 's fashion pursuits ... but her outfit gained the most attention when she accidentally flashed her backside. The singer-songwriter stepped out in an all-black ensemble Friday night to attend her man's AWGE fashion show in New York City ... and her leather jacket opened a bit too wide and revealed the star's famous derrière. Check it out ... the jacket's skirt is split in the back and the split reaches just a bit too high up her legs, revealing the bottom of

Tag-uri: accident