Kelly Osbourne treated mum Sharon to a special surprise on Mother's Day. 

The 'Papa Don't Preach' singer and face of Madonna and Lourdes' 'Material Girl' fashion line decided to show her appreciation for having such a great relationship with her mother by filling her room with 300 balloons. Mother's Day in the U.S later than in the UK and fell yesterday, May 8. 

Tweeting to her followers, she teased:

"I surprised my mum today i filled the room with 300 balloons. and i have more surprises in store for her later!!"

Sharon Osbourne also took to social networking site Twitter later than day and posted a photo to show her fans the treat:

"Happy Mothers Day to all the beautiful momma's in the World. This was my wake up surprise..."

Watch a joint interview with the mother and daughter here: