The Oscar-winning actress - who adopted little Louis in January 2012 when he was a newborn - admits the tot has already developed an eye for the ladies, which can sometimes cause her embarrassment.
She said: "He`s a little flirt! He definitely appreciates the fairer sex.
"He doesn`t flirt with me like that, and someone told me that`s probably a good thing. He`s got a look where he just cuts the eyes at the ladies, and I`m like, `I`m so sorry! I don`t know what`s happening.`"
Sandra also admits she`s very biased when it comes to Louis - who she started to adopt with ex-husband Jesse James and carried on the process after discovering he had cheated on her - and can`t wait to spend the festive season with him.
During an appearance on `The Late Show with Jay Leno`, the `Extremely Loud and Incredibly Close` star said: "He is probably the best baby in the world, but I think every parent says that."
"I don`t think he understands the concept of Christmas yet, but he does understand that everything at his height level is really bright with lots of lights. He doesn`t get it yet but I think next year he`ll get it and demand things."