Written and first recorded by the Bee Gees (1975).
Hit version by Olivia Newton-John (US #23/MOR #1/C&W #5/CAN #22/NZ #3 1976).
From the wiki: “‘Come On Over’ was by Barry and Robin Gibb and was first recorded by the Bee Gees for their 1975 album Main Course, produced by Arif Mardin in Miami, FL.
“A year later, in 1976, Olivia Newton-John’s cover of ‘Come On Over’ was released as the title track and promotional single for her album Come On Over. Her recording peaked at #23 on the Billboard Hot 100. It was also Newton-John’s sixth #1 in a row on the Easy Listening chart, for one week in April 1976. ‘Come On Over’ also peaked Top-5 on the US Country Singles chart.”
Olivia Newton-John, “Come On Over” (1976):