Osbourne will be expected to cover all aspects of next weekend's festival, taking coverage from the different areas, stages and VIP sections. Each day her video diary from the last 24 hours will be posted on the Orange Glastonbury website for public viewing.
Osbourne said: "Ever since I was a child I wanted to go to Glastonbury, so when Orange asked me to catch it all on film I didn't even have to think twice."
Hattie Magee, head of partnerships at Orange UK, said: "We are delighted to be working with Kelly. Over the last year Kelly has really proven herself as an artist and this is just another way Orange brings music fans closer to the music."
Last year another old rocker's daughter, Peaches Geldof, made a Glastonbury video diary for Orange.