Lorenzo Lamas dropped Shauna Sands for bedding his son?

As the only actor to star in all 228 episodes of that sudsy drama called ‘Falcon Crest,’ Lorenzo Lamas is accustomed to intrigue and secret affairs. But this was probably not enough preparation for the news his own wife was sharing a bed with his son.

Lorenzo, 51, dumped his fourth wife, April 1996′s ‘Playmate of the Month,’ Shauna Sands, 37, when he discovered she was sleeping with Lorenzo’s 18-year old son from his second wife, ‘The Bachelor’ star, Michelle Smith.

According to friends, the affair went on for months before ‘Daily Show’ regular, Lorenzo found out, “Shauna came on to A.J,” one friend told the Star. “Lorenzo had no idea – he was in the dark about the whole thing. He thought Shauna was just being like a mom,” the insider confirms. “He had no idea she was his son’s secret lover!”

You can see just how badly this deception has scarred him in a new reality show Lorenzo’s been taping for E. No air date is set yet, but check TV Guide.