Jennifer Aniston Gives Angelina Jolie A Run For Her Money In New Charity Ad: Video

Jennifer Aniston is appearing in a new US television advertisment for St. Jude Children's Research Hospital to help promote their cause.

The actress - who is a regular supporter of the hospital - appears alongside Ellie, a young girl who has a tumour.

Jen sits with her arms wrapped round Ellie saying, "Every night Ellie's mum whispered in her sleeping daughter's ear. She said, 'go away tumour, go away.'

"And to help that tumour go away her parents turned to St. Jude Children's Research Hospital where our discoveries have doubled Ellie's chance of survival."

Take a behind-the-scenes look at the touching new advert below