Justin Bieber's big solo comeback single has leaked on the Internet hours before its radio premiere on Friday (28Aug15).

The Baby hitmaker has been teasing fans about his first solo release since 2013 since last month (Jul15) by enlisting celebrity pals, including Ben Stiller, Alec Baldwin and Britney Spears, to feature in his 30-day countdown to the premiere of What Do You Mean? on Instagram.com.

He shared a snippet of the lyric video on the site on Thursday (27Aug15) but the full version leaked online hours later. The videos have since been removed but the audio is still available, so fans no longer have to wait until the radio premiere to hear the song.

Bieber is set to perform What Do You Mean? for the first time in public at the MTV Video Music Awards on Sunday (30Aug15).