When Olivia Newton-John announced in January that she’d be headed to San Antonio, we were more than a little stoked about it because Grease, duh. The four-time Grammy award-winning singer, actress and community activist will make an appearance at the Majestic, and we hope she’ll be bustin’ out a few Grease tunes as well as ‘80s anthems “Physical” and “Twist of Fate.” Not only has Newton-John pumped out the hits, she also has held many humanitarian and environmental causes close to her heart. Olivia served as Goodwill Ambassador to the United Nations Environment Programme, was the co-founder of Children’s Health Environmental Coalition (now Healthy Child, Healthy World), and, in 1992, created National Tree Day in Australia, which has since planted more than 10 million trees. Most recently she co-founded One Tree Per Child, an international school initiative with the goal of having every child under the age of 10 plant at least one tree (awwww).