Lawyers for the illusionist say the allegations are "false and scurrilous".

The singer was speaking exclusively to BBC News ahead of the launch of a new V&A exhibition.

The BBC asked members of the public what they thought of the newly unveiled official portrait.

Salma Hayek and Dua Lipa were also at the event which saw the Tate Modern transformed for the show.

The broadcaster replaces Martha Kearney, who announced in February she was standing down from the show.

Dolly Parton has traced her ancestry to the Welsh valleys for a TV show, according to reports.