In a blog posted on Parents.com, the 33-year-old said her daughter Maxwell, 17 months and four-month-old son Ace have "changed my perspective completely" and stopped her being so hard on herself.
"My pregnancies (especially my first with Maxwell) were well documented and my struggles with my weight and body image have played out in front of the world," Jessica wrote.
"As hard as that has been, the hardest part is to realise that will all the hurtful and harsh criticism from others, I have been the hardest on myself.
"Raising Maxwell makes me realise that I don't want her to see me beat myself up for things like food choices or numbers on a scale," added the star, who became a Weight Watchers spokesperson after her daughter was born.
"Those things don't determine who we are and instead make us feel terrible about ourselves… I want her to know her value, rather than spending her energy fighting negative voices from within."
The proud mama goes on to say that having her two children with fiancé Eric Johnson has made her feel "very complete".
"Being a mum has helped me realise I'm actually proud of myself for a lot of the things I have done in my life," Jessica revealed. "Having kids has made me feel so much more at peace with myself."