Next week Denise is trekking the Great Wall Of China for charity, so Kimberley will be filling in for her on Magic FM.
Denise will even be calling in to chat to the Girls Aloud star during the show to tell her and listeners how the walk is going.
Announcing the news on Twitter today (6 September), Denise told fans: "Exciting news! My gorgeous friend @KimberleyJWalsh will be keeping my @magicfm seat warm DJ'ing 1-3pm when I'm in China.
"I will be chatting to @KimberleyJWalsh from the Great Wall of China Saturday 14th @magicfm giving an insight into my challenge."
Kimberley replied saying: "Can't wait I'm so excited!"
Denise and Kimberley became friends after trekking Mount Kilimanjaro with a group of fellow celebrities for Comic Relief in 2009.
Last year, the pair both took part in Strictly Come Dancing, which brought them even closer together.
Will you be tuning in to hear Kimberley on the radio? Tell us below, as the best comment from across the website each week wins £50!