Miley Cyrus has been “acting out” since her parents announced they’re getting divorced.  The Hannah Montana star — who earlier this week celebrated her 18th birthday — is devastated dad Billy Ray and mom Tish have split and apparently blames her career for the destruction of their marriage.

“Miley’s spinning out of control,” a worried pal told American tabloid the National Enquirer. “She carries a lot of guilt — most of Billy Ray and Tish’s arguments were over her career.

“She’s acting out in the worst possible way.

“This is a girl searching for herself.”

Recent reports have claimed Miley’s career tore her family apart.

“The fight over Miley is what tore Tish and Billy Ray apart. They can’t agree on how to raise her, and it’s wrecked their marriage,” an insider said.

“Billy Ray thinks Miley is becoming a spoiled-brat monster – and he thinks it’s ALL Tish’s fault.

“They’ve had screaming matches for years.

“Billy Ray doesn’t like that he was eclipsed by his daughter’s stardom.

“He used to be the biggest star in country music and he wants his old life back.”

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