"The programme is based on ability - it's not age-based, " said communications manager Charlotte Church.
It was signed by 60 phone-hacking victims, including Mr Grant, actor Jude Law and singer Charlotte Church.
Both Charlotte Church and Jacqui Hames claim they have been victims of hacking by News Group Newspapers and other "media wrongdoing".
The Sun has many things to be ashamed of, but running a Charlotte Church Countdown Clock is not one of them.
FORBES: News International and the Charlotte Church Countdown Clock
Charlotte Church has attacked an "out of control tabloid industry" following a newspaper report she had proposed to her boyfriend while drunk.
Performers like Gina G, Charlotte Church and Noel Sullivan all took part, along with Doctor Who and Queer as Folk writer Russell T Davies.
Singer Charlotte Church says she is worried about how her children cope with the break up of her relationship with their father Gavin Henson.
BBC: Charlotte Church: Worry for children after Henson split
Earlier, the request on behalf of Charlotte Church and Jacqui Hames was made at the High Court, where a preliminary hearing was held on Tuesday.
Charlotte Church, Gina G and Bjorn Again are among those appearing.
Charlotte Church could be among the first to give evidence at the inquiry into media ethics and phone hacking, if she is accepted as a witness.
Opera singer Bryn Terfel is already booked to launch the WMC on 26 November, with the line-up also including Charlotte Church, Matthew Rhys, Sian Phillips, Ruthie Henshall and Jonathan Pryce.
He is the latest in a long list of big names, inlcuding fellow singer Charlotte Church, Full Monty star Mark Addy and David McCallum, to have guest starred in the series.
Luckily, comedians Matt Lucas, better known as George Dawes, and David Lucas provided some humour when they dressed as Charlotte Church and Eminem to present the prize for best British male.
The Noah's Ark Appeal was launched in May 2000 and has the support of a number of celebrities including former England cricketer Ian Botham and Welsh stars Charlotte Church and Shirley Bassey.
Onlookers said Henson, the partner of singer and TV presenter Charlotte Church, was seen messing about with pool balls on the three tables in the pub and was abusive when anyone took issue with him.
Might Charlotte Church have been mistaken?
FORBES: News International and the Charlotte Church Countdown Clock
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