Miley Cyrus has a secret boyfriend.

I wonder if it's a secret to him ...

Cyrus has been dating her "Bangerz" producer Mike Will Made-It for the past nine months, multiple sources told Us Weekly.

"Everybody in her circle knows they've been together this whole time," a source close to Cyrus reportedly said. The 21-year-old started seeing the 25-year-old producer soon after splitting from Liam Hemsworth in September.

Another insider told the magazine the pair has become "pretty serious." Made-It even won over Cyrus' mother, Tish.

"Tish says he's part of the family," the insider said.

Of course he is.

Miley Cyrus arrives at the 2008 MTV Video Music Awards held at Paramount Pictures Studio Lot on Sunday, Sept. 7, 2008, in Los Angeles.
Miley Cyrus arrives at the 2008 MTV Video Music Awards held at Paramount Pictures Studio Lot on Sunday, Sept. 7, 2008, in Los Angeles. (AP Photo/Chris Pizzello)

While on tour, Cyrus has made a point to stay connected to Made-It. Despite not always being in the same city, the couple makes sure to "talk and text all day, every day," the source says.

Tony Hicks provides celebrity commentary for the Bay Area News Group. Contact him at Facebook.com/BayAreaNewsGroup.TonyHicks or Twitter.com/insertfoot.