They say a man's word is the measure of his character, and it looks like we're about to find out what sort of character Calvin Harris really is.

An Australian fan of the Scottish DJ has just reminded him of a promise he made five years ago when he met him backstage at a gig in Sydney.

According to Filip (with an F), Harris promised to remix the Spice Girls' '2 Become 1' if or when the marriage equality law was passed in Australia.

And, as you may have heard, the law has been officially passed Down Under in recent days.

So, Calvin, it's over to you... a deal is a deal, as the man says...