One of the three secret celebrities for "Who's on Heart" 2013 was guessed this morning by a lady named Debbie. Debbie's three guesses were Sharon Stone, Elton John and David Duchovny, and for her correct answer she won £10,000. Congratulations, Debbie.
However, it was never stated on-air exactly which of her guesses is one of the three voices, and listeners have had to work out which is the correct one. People on the thread for this article think it's Duchovny and I am sure it's him because Stone has already been guessed and John's voice doesn't sound like any of the three.
This is also the first time I've heard a correct answer be given live, rather than have to find out about it hours after it happened. The competition's excitement has increased!
25/04/2013 update: It has long been confirmed that David Duchovny is the first guess; the second guess has been covered here.