Sigler gave birth to her son on Wednesday, her representative conformed, reported Ace Showbiz.
"Both mother and baby are doing great," her representative said in a statement.
Sigler, 32, and 24-year-old Cutter got engaged in January and revealed the baby news in February.
Early this month, Sigler threw a baby shower attended by her celebrity friends like 'Glee' star Lea Michele, former NSYNC member Lance Bass, and "7th Heaven" actress Beverley Mitchell.