Josh Duhamel — ‘I Always Wanted a Boy’

Exclusive 081213_josh_duhamel_launchJosh Duhamel is having a little BOY … and he”s totally psyched about it — telling our sources, “It”s gonna be fun to teach him what I know.”

Duhamel”s wife Fergie is due next month — and at LAX this weekend, the “Transformers” star told us how pumped he is that the ultrasound showed boy parts.

During the convo, our photog had an honest moment — telling Josh he”s nervous about having children because he”s scared to death to have a girl … with the dating and the makeup and the whathaveyou.

Josh told the photog he feels his pain — explaining, “I have 3 sisters. It wasn”t fun as an older brother.”

So, what”s easier — raising a boy or raising a girl Someone”s gotta have the answer …