When Johnny Depp made a special appearance on July 16 at an Aerosmith concert, one person was there to support the actor: his fiancée Amber Heard.

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According to E! Online, Depp made a special guest appearance during the Aerosmith encore at the legendary rock groups concert at the Xfinity Center in Mansfield, Mass.

The website reports that Depp played guitar during Train Kept a Rollin', the final song of the night. Heard was reportedly backstage supporting Depp. Fans went "nuts" for the Pirates of the Caribbean star's surprise performance.

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Depp has been filming his latest film Black Mass in Massachusetts recently, where Heard would visit him in between shooting her own film The Adderall Diaries in NYC. "Johnny has gotten in the habit of setting up remote weekend getaways with Amber and the kids," a source said told Radar Online, "and usually he will lease a helicopter and have them all ferried to a remote location or resort in Southern California."

Heard is reportedly close to Depp's two children with ex-partner Vanessa Paradis. "It took Johnny a long time to get to this point with the kids, but this spring has marked Amber becoming a true part of the family and being involved with the upbringing of Johnny's kids - albeit on a somewhat limited basis," a source recently told Radar Online. "Amber sees Johnny's children nearly every weekend Johnny does, especially when they're in Los Angeles and not working on sets."

Tags: Johnny Depp Amber Heard