With just over a week until Red Nose Day, the celebrities are out in force promoting the designer T-shirts sold for Comic Relief at TK Maxx.
In the video, the celebrities urge the public to play their part in fundraising for the cause.
Allen says: “There are people here in the UK and in Africa who need your help. So please buy a T-shirt – they look pretty cool!”
O’Leary adds that TK Maxx has raised £13.4million for Comic Relief, and is hoping to boost that even more this year.
The video also shows Tom Hiddleston, David Gandy and Daisy Lowe modelling versions of shirts designed by Anya Hindmarch, Diane von Furstenberg, Matthew Williamson, Karl Lagerfeld and Henry Holland.
YOu can watch the video over at digitalspy.co.uk