Rihanna claims she can turn a straight woman bisexual.

The 'Good Girl Gone Bad' singer made the boastful claim on twitter on Sunday night (06.05.12).

She wrote: ''Guarantee to turn a square into a Bi bitch!!!''

The public message was thought to be in reference to an E-40 song titled 'Function', which features the lyric ''Guarantee turn a square to a bop bitch''.

The 24-year-old performer has been making headlines for a number of controversial reasons recently.

She posted a picture last week, showing herself tucking cash into a bent over stripper's underwear while gripping a drink between her teeth.

She is also reported to have angered 'Saturday Night Live' producers this weekend when she failed to show up to a final dress rehearsal.

Rihanna allegedly sent her choreographer instead, claiming that she was too ill to attend.

The show's employees were reportedly angered as she did not seem ill enough to have missed the dress rehearsal when she was spotted walking around the studio in between performances on the night.

A representative insisted that she was sick, telling TMZ: ''Rihanna was sick and needed to save her voice for the live show.''