You can't deny the genes -- Arnold Schwarzenegger's son, Joseph Baena, who just turned 16, is looking a lot more like his dad with age, muscles and all.

"Baena, sporting a Batman tank and shaggy dirty-blond hair, was seen leaving his school swimming pool Tuesday, showing off his bulging biceps and toned torso," Fox News Latino reports.

Joseph is also the son of Mildred Baena, who was Schwarzenegger and ex-wife, Maria's Shriver's Guatemalan housekeeper for 20 years, with whom the actor had an affair.

The teen has taken after his father in terms of his athletic ability as well. The Daily Mail reports that the teen specializes in the butterfly stroke for his high school's team.

The father and son were spotted shopping in Bakersfield, Calif.

In an interview with 60 Minutes, the former Republican Governor of California commented on his affair with Mildred Baena. While remorseful, the actor didn't say he had any regrets having his son, Joseph.

"I think it was the stupidest thing I've done in the whole relationship," the Terminator actor said in the interview. "It was terrible. I inflicted tremendous pain on Maria and unbelievable pain on the kids."

Schwarzenegger and Shriver, 56, are parents to Katherine, 22, Christina, 21, Patrick, 19, and Christopher, 15.

Despite the pain he caused, Schwarzengger has been trying to make amends for his actions. He talks with Joseph on the phone regularly and for his birthday the actor gave him a complete gym, according to TMZ.