Can you tell who it is yet? Well, among the comedy actor Stephen Mangan of Green Wing fame, the rower James Cracknell, the BBC's Peter Salmon and the Dragons' Den entrepreneur Theo Paphitis is Abbott Mead Vickers BBDO's chairman, Cilla Snowball.
But it wasn't just an excuse for Snowball to hob-nob with the celebs, the team were out there to do their bit for "charidee" and experience first hand how Sport Relief money helps the underprivileged.
Maybe Snowball will follow in Cracknell's footsteps once again and embark on a rowing, cycling and swimming expedition to Africa for this weekend's Sport Relief. But Diary hears she's opting for a one-mile jog along the Thames instead.