The 35-year-old made the announcement on Instagram, posting a stunning selfie with her new baby boy, Ennio Stanley Gleave.
"He arrived this morning after a relatively quick natural and drug-free birth," she captioned the post.
"3.3kg Both of us happy and healthy. Just as overwhelming second time round."
She posted an adorable, close up of Ennio shortly after.
Her musician husband Example also posted a photo of baby #2, thanking his wife for "baking this perfect little cake".
Ennio joins older brother Evander, 2.