Miley Cyrus Admits 'Full Circle' Is About Nick Jonas

'Surprise, surprise, it's about a Jonas brother,' Cyrus reveals of the '08 track during concert in Portugal.

[artist id="2408193"]Miley Cyrus[/artist] may be happily dating her "The Last Song" co-star Liam Hemsworth, but she had another boy on her mind when it came to recording "Full Circle," from her Breakout album. While performing at the Rock in Rio concert in Lisbon, Portugal, on Saturday, Cyrus surprised fans when she revealed the inspiration for the track was none other than JoBro Nick, her onetime flame.

"It's about two people. They're always gonna come back together no matter what anyone says, the bad people that try to keep you apart. It's a personal story," Cyrus can be heard telling the crowd in a video posted online.

"Surprise, surprise, it's about a Jonas brother," she smiled. After singing a few lines, the singer added, "You didn't hear that."

The song isn't new, but the revelation was. Miley and Nick dated for nearly two years before breaking up in 2007. On the chorus, Cyrus sings, "I try to run/ But I keep on coming back/ Full circle/ And I can't jump the track/ Can't let you go."

The "Can't Be Tamed" singer has never been too shy about discussing her relationships, but the star initially tried to keep the one with Nick under wraps. In a 2008 interview with Seventeen magazine, Cyrus opened up, confirming their relationship — and their breakup. In her book "Miles to Go," published last year, she called Jonas her "Prince Charming."

But the Lisbon concert wouldn't be the first time the exes have used music to address their on-again, off-again relationship. In 2008, Cyrus released the breakup track "7 Things." The video's director, Brett Ratner, confirmed fans' suspicions about the song's intended target, when he noted that a piece of jewelry Miley wore in the clip was a gift from Nick.

"The necklace she's wearing in the video is the necklace he gave her," Ratner told MTV News at the time. "She's wearing his diabetes or medical necklace."

The couple reconciled for a short time in 2009, recording the ballad "Before the Storm," off the JoBros' fourth album. But they parted ways again after Cyrus met Hemsworth on set. Jonas is currently unattached; he last dated Disney star Selena Gomez.

Were you surprised to hear that Nick was the inspiration for Miley's "Full Circle"? Tell us in the comments!