Lucy Hale has been unveiled as the new ambassador for St Jude Children's Research Hospital, and stars in an ad to raise awareness of Childhood Cancer Awareness Month in September.

The Pretty Little Liars star took to Instagram to share clips from the ad, captioned 'Humbled & thrilled to be @stjude ambassador for Child Cancer Awareness Month. St Jude is located in my hometown of Memphis & has such a special place in my heart'.