The song, which marks the singer-actress' first music in seven years, is a radio-friendly, pure pop tune with a 1990s-early 2000s feel, reported Ace Showbiz.
"I'm chasing the sun. Won't miss out on the fun. Gotta get it while our hearts are young. I'm chasing the sun," Duff sings the chorus.
The track serves as the first single off Duff's comeback album that's due out later this year via RCA Records.
"I've worked very hard and the album is a great representation of the experiences I've had in my life and where I want to go from here!