The 26-year-old star is the face of the 'Celebration' hitmaker's clothing range Material Girl - which was created with her 14-year-old daughter Lourdes - and she admits she loves working on the brand because she has always been a fan of the 52-year-old singer's fashion sense.
She said: "I'm really enjoying being the face of Material Girl. I love being part of a brand for girls and having the opportunity to work with Lourdes who has an amazing fashion instinct.
"Added to that is the fact that Madonna has been an influence on my style over the years."
Discussing working with Kelly on the forthcoming MG+NYC collection, Madonna added it had been great.
She said: "We have both enjoyed working with Kelly and are thrilled to have her on board for the launch of The Fall 2011 collection."
The 'Fashion Police' presenter previously revealed she loves clothes which fit her frame and is glad to have lost 50lbs in 18 months.
She said: "Because I'm short - and I'm not calling myself fat when I say this, but I'm a rounder girl, I'm not a stick - I wear stuff that fits my curves.
"I've always dressed the same but before I wasn't able to fit into the clothes I wanted to. I just think I'm very me. I'm the girliest tomboy you'll ever meet."