Jessica Biel thinks motherhood is ''magical''.

The 'Total Recall' star and husband Justin Timberlake welcomed their first child, son Silas Randall, into the world in April this year and the actress loves seeing her little boy smile.

Asked what her favourite thing he does is, she gushed to E! News: ''Probably the moment he wakes up from a nap. He's sort of looking around and you sort of creep up and look over the crib and he looks up and he [sighs].

''Just a gummy mouth, no teeth, just a big smile, happy that you're alive and you're just looking at him. That's probably the most magical.

''[I get emotional] but you quickly move on from it because there is a dirty diaper in your palm.''

Meanwhile, the 33-year-old beauty is reportedly growing fed up of her husband's ''protective'' nature.

A source said: ''Justin means well. But Jessica is getting annoyed because they hardly ever go out.

''Justin makes sure the security cameras are working every morning and he insists Silas sleep in a crib beside the couple's bed.''

After the baby was born, Justin and Jessica stayed at their home in the exclusive Yellowstone Club in Montana before moving back to Los Angeles.

The source added at the time: ''Their house is all set up for the baby. They want to raise him out of the spotlight.''