The singer – the daughter of Linda Bollea and her ex-husband Hulk Hogan, real name Terry Bollea – was stunned to discover Linda is dating her old classmate Charlie Hill.
Brooke, 20, said: "I went to school with him. He was a grade under me. I'm totally freaked out. This is really weird - I personally don't like it at all, or condone it. But she is my mom so I have to show her support."
Brooke also revealed she is finding it hard to deal with the events surrounding her family.
When Linda filed for divorce from Hulk, her husband of 24 years, in November 2007, it was rumoured he was dating one of Brooke's closest friends, Christiane Plante.
Meanwhile, Brooke's brother Nick is currently in prison for eight months on charges of reckless driving, after he crashed his car while speeding leaving his friend and passenger in a vegetative state.
Brooke told US TV network E!: "I am just staying the course and dealing with it and supporting my family. I thought we were one of the normal Hollywood families. It's crazy watching it all fall apart, but I hope for the best."
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