Katy Perry in 'tough conversations' with her record label

The boss of Capitol Records says he's had "tough conversations" with Katy Perry following disappointing sales of her latest album, Witness.

Perry released her fourth album last June but, despite appearances at Radio 1's Big Weekend and Glastonbury, it failed to catch on with fans.

It entered the UK charts at number six, after selling 16,153 copies. To date, it has sold less than 60,000.

All of Perry's previous albums sold more than 500,000 copies in the UK.

Her best-seller is Teenage Dream, which earned four platinum discs, representing sales in excess of 1.2 million.

Perry is currently in the middle of her Witness world tour, which has fared better than the album it's named after.

The lavish, fun-filled show made $28.1 million (£20.4 million) last year - despite the odd technical malfunction - and is set to hit the UK in June.

Perry will also make her debut as a judge on American Idol in March - and Barnett said she'd already started to plot a musical comeback, reports BBC.

"She has a plan, and we have a plan, and I feel good about it."