Rihanna has become embroiled in a nasty online feud with rising singer Teyana Taylor.

The two women began sniping at each other after Rihanna posted a video mocking the singer on her Instagram.com page.

Taylor recently uploaded a video of herself singing a cover of Anita Baker's Caught Up In The Rapture, and the Umbrella star countered by posting a clip of her male hairstylist, dressed in a wig, performing the same song badly.

The apparent jibe appeared to provoke Taylor, who subsequently sent Rihanna a barrage of angry messages via Twitter.com, writing, "Don't play wit (with) me Rihanna f**k all this industry s**t, you & I know each other very well. Throwing subs (hints) 4 wat (sic)? U (you) got my # (number), don't show off... Y'all could bully everybody else & get away wit (with) that s**t but that s**t ain't gone (sic) work ova (over) here... Petty is petty and shade is shade, b**ch knew what the f*ck she was doing."

Rihanna later changed her Twitter homepage to a shot of an article comparing her estimated $90 million (£60 million) fortune to Taylor's $500,000 (£333,333), and wrote, "I refuse to help your career... you will not get an @ (Twitter mention) from me! Not til you pay me. No more free promo. I refuse."

Both women later deleted their tweets and Rihanna changed her home screen page again. When a fan asked Taylor, "(Why) did you delete ur (your) tweets after cussing Rihanna out for deleting hers?" she replied, "Mom dukes (my mother) asked me to take em (sic) down, so I did. But I still mean every single word."