Olivia Newton-John, AO, OBE (born 26 September 1948) is an English-Australian singer, songwriter and actress. She is a four-time Grammy award winner who has amassed five number-one and ten other Top Ten Billboard Hot 100 singles, and two number-one Billboard 200 solo albums. Eleven of her singles (including two platinum) and fourteen of her albums (including two platinum and four double platinum) 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.