The former Hannah Montana star was thought to have moved on from her former fiancé Liam Hemsworth with the hip-hop star/writer/producer, who produced her hit single 'We Can't Stop'.
But a rep for Mike has told E! News that just isn't true and they are only spending time together as Mike is working on Miley's new album Bangerz.
The rep said: "They work closely professionally and it is all about the music."
Miley announced mid-September that she and Hunger Games actor Liam had ended their engagement.
The couple began dating in 2009 after meeting on the setoff romantic drama The Last Song, but had been plagued with split rumours in recent months. A break-up announcement seemed imminent when eagle-eyed Twitter users spotted that Miley had stopped following Liam on the social networking website.
Miley and Liam were last seen in public together at the 8 August premiere of Liam's movie Paranoia. Prior to that, their last red carpet outing as a pair was a year before.
Both Miley and Liam have been throwing themselves into work this month. Miley's been promoting new single 'Wrecking Ball' (where she swings around naked in the accompanying music video) and putting the finishing touches of album Bangerz, which is out in October.
Meanwhile, Liam has been spotted on the set of the new Hunger Games movie Mockinjay in Atlanta.
He's also rumoured to have struck up a romance with Mexican actress Eiza Gonzalez after the pair were spotted kissing in Beverly Hills earlier this month.