The reality TV stars will play for charity on the Channel 4 gameshow's final edition of the current series later this month.
The star couple will join the last pairs of ordinary contestants as they aim to win big for their chosen charities.
The Million Pound Drop Live has aired for the last month on Channel 4, scoring solid ratings for the broadcaster.
Hosted by Davina McCall, it was announced last month that eight special episodes featuring famous athletes would be screened in celebration of the London 2012 Olympics.
The Million Pound Drop Live continues to air on Fridays and Saturdays on Channel 4 from 9pm.