Hugh Bonneville & Brendan Coyle both lent support to the UK's biggest clothing collection, "Give up Clothes for Good". It's to raise money for Cancer Research UK to help beat kids' cancer.
Joining in is easy - just clear out your drawers wardrobes and cupboards, and take any unwanted, quality clothes to TK Maxx between 1-30 April.
Below you'll find both their ads plus the behind the scenes filming video:
Behind the scenes: