R&B star Ray J has been threatened with legal action by bosses of a watch brand for allegedly promoting a range of similar products.

The One Wish hitmaker launched the Rsnl by Ray J watch line with his business partner David Weintraub in December (14) and bosses of luxury watch brand Audemars Piguet have noticed a similarity between one of Ray J's timepieces and their signature Royal Oak design.

Lawyers representing the firm sent Ray J, real name William Norwood, a cease and desist asking him to stop selling the product by 3 February (15) or face legal action.

Weintraub tells Tmz.com they will continue with plans to release the watch to U.S. stores.