Freddie Mercury's "secret daughter" speaks out for first time, amid scepticism from singer's best friend
The woman, referred to only as 'B', makes the claims in a new biography of the Queen singer, out in September
John Deacon makes rare Queen contribution with Brian May and Roger Taylor for signed album
The album will be up for silent auction at the annual Freddie Mercury Birthday Party to raise money for HIV/AIDS Awareness
Freddie Mercury had a secret daughter, new biography claims
The book alleges that the late Queen frontman kept a close relationship with the child until his death in 1991