Miley Cyrus surprised Nashville Star judge Jeffrey Steele with an impromptu appearance at a fund-raiser over the weekend in memory of Steele's son, who died last year, PEOPLE reports.

Miley Cyrus surprises Nashville Star judge Jeffrey Steele

Steele's 13-year old son Alex LeVasseur, an avid skateboarder, was killed in an ATV accident in 2007, a tragedy that inspired his family to create The Alex LeVasseur Fund. On Sunday, Steele and his family presented the second annual Alex LeVasseur Memorial Skate Festival at Jim Warren Park in Franklin, Tenn., to benefit the fund – complete with a star-studded concert.

"When Jeffrey introduced Miley, all the kids who had been skating in the park next to the concert just rushed the stage," said an observer. "She was so full of energy, she just looked adorable. Jeffrey was clearly very touched by her appearance."

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