Appearing on The Rachael Ray Show, the actress explained that Honor has unique ideas about fashion and refuses to listen to anyone else when it comes to her wardrobe.
"She's very independent, very opinionated and loves dress up so much," Alba said.
"Like every day, she's in full drag! She wears a wig every day. She has a lot of wigs and she has a lot of plastic heels. It's totally insane, but it makes her happy."
Alba and husband Cash Warren are also parents to 5-month-old daughter Haven Garner, whose birth she later described as "unusual".
The 30-year-old recently launched her own eco-friendly line of baby and household products.