TERMINATOR TOO!

Arnold's bodybuilding boy muscles into Dad's territory

- 

MUSCLEMAN Arnold Schwarzenegger's look-alike "secret" son is following in his biceps -winning his first major bodybuilding competition.

The Terminator star's "love child" Joseph Baena, 28, recently snagged top honors in several categories at the NPC Natural Colorado State Competition.

But the prize comes as Arnold, 78, confesses the revelation that he'd fathered Joseph wrecked his marriage and building a father-son relationship hasn't been easy.

"It was tough on everyone," the True Lies star admits.