Miley Cyrus has been secretly dating the producer behind her Bangerz album for the past nine months, according to a U.S. report.

The Wrecking Ball star is said to have struck up a romance with Mike Will Made It last year (13), shortly after she split from her fiance Liam Hemsworth.

A source tells, "Everybody in her circle knows they've been together this whole time," while another insider insists the pair keeps in close contact while the pop singer is away on tour, explaining, "(They) talk and text all day, every day."

Mike Will Made It, real name Michael Williams, 25, has previously worked with Rihanna and Lil Wayne, and was the executive producer on Cyrus' hit 2013 album.