Dispute: Rock and Republic owner Michael Ball with the firm's president Andrea Bernholtz

News of the legal case follows recent claims that Victoria, 34, has not been doing enough to publicise her latest dVb denimwear line. Sales have reportedly been so poor in the US that a number of key retailers are expected to drop the range next season.

Kitson, a favourite boutique of LA celebrities, was among the stores rumoured to be planning to axe the label, with owner Fraser Ross speaking to the Press about the disappointing performance.

In an interview with the US celebrity magazine People, Mr Ross blamed declining sales on Victoria's lack of promotional activity.