What was Olivia Newton-John's first #1 song in the U.S.?

"I Honestly Love You" gave Newton-John her first taste of chart domination in October 1974, staying at number one for two weeks. The song came courtesy of Jeff Barry, who had already proven he could craft radio gold with girl group classics like "Be My Baby" and "Then He Kissed Me," and Peter Allen, who knew his way around a memorable melody. Newton-John's breathy delivery turned their lush ballad into the kind of soft rock perfection that defined mid-70s radio. The Grammy voters loved it too, handing her awards for both Record of the Year and Best Pop Vocal Performance.