Former Playboy model Shauna Sand cheated on ex-husband and soap opera star, Lorenzo Lamas, with his then-18-year-old son, A.J. Lamas, Star Magazine reports

“He thought Shauna was acting like a mom to A.J. He had no clue that she was his son’s lover!” a friend of Lamas told the magazine.

PHOTOS: Click for pics of Shauna Sand with with the young crowd.

Lorenzo filed for divorce in 2002, months after the romance between Sand and his son reportedly heated up.

Sand and younger men is nothing new. The 37-year-old party girl is currently dating twentysomething Gregory Knudsen, and is estranged from Romain Charvent, also in his twenties.

PHOTOS: Click here to read more from Star Magazine.