Olivia Newton-John, AO, OBE is an English-born Australian singer, songwriter and actress. She is a four-time Grammy award winner who has amassed five No. 1 and ten other Top Ten Billboard Hot 100 singles and two No. 1 Billboard 200 solo albums. Eleven of her singles and 14 of her albums have been certified gold by the RIAA. She has sold an estimated 100 million records, making her one of the world's best-selling music artists of all time. She starred in Grease, which featured one of the most successful soundtracks in Hollywood history.