While leaving the Montrose Church in Montrose, Calif., on Sept. 13 with her family, it was hard not to notice the tall, dark and hunky guy accompanying Miley Cyrus from  services!

The 15-year-old Disney star has been dating 20-year-old Justin Gaston — a sexy underwear model and aspiring singer who, apparantly has the approval of Miley’s dad, Billy Ray Cyrus. In fact, Billy Ray is reportedly the one who introduced the pair!

"Miley and Justin were really playful with each other," an eyewitness at the evangelical church tells OK!. "And for being with her parents, they were extremely touchy-feely.  Miley had her hands on Justin’s stomach. They definitely seemed like a couple.  Her parents, Billy Ray and Tish, really gave them space."

But at just 15, is the five-year age difference shoving the Hannah Montana star into the fast lane?

The 6-foot-tall Louisiana native is signed with Vision Modeling Agency and just starred in an underwear campaign for the online cataglog International Jock. He appeared on Nashville Star earlier this year but was eliminated on June 23. Billy Ray, 47, who is a host on the show, reportedly took the aspiring singer under his wing, eventually introducing him to Miley.

Men’s director at Vision, Allen Osborne, says Billy Ray thinks very highly of Justin. 

"He doesn’t drink. He doesn’t smoke," Osborne explains. "He’s a very up-and-up guy."

But while Justin is getting flack for his provacative underwear photos, it’s not anything Miley herself hasn’t done! The teen recently had to answer to a crop of racy underwear pics herself, taken with a camera phone and somehow leaked onto the internet.

For the full story on Miley’s new man, pick up the new OK! — on newsstands everywhere Thursday!

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