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Gisele Bundchen may have said that labor didn't hurt "in the slightest," but she does admit that her natural childbirth was "a powerful experience."

The 29-year-old supermodel -- who gave birth to Benjamin with hubby Tom Brady in December -- is opening up about being a mom in her brand-new blog!

Find out more about Gisele's new blog at!

"Being committed to building a family, becoming a mother and raising a child with love and awareness is for me, the single biggest responsibility a woman could have," she wrote in her first post Monday. "Giving birth was the most intense and life-changing experience of my life... I never felt so vulnerable but so strong at the same time."

See more photos of Gisele and other pregnant supermodels

She also writes that she was "blessed" to welcome Benjamin into the world at home "where I was able to feel safe."

The star recalls "allowing my mind and my body to let go and be free to experience the changes taking place within" while she was "surrounded by love."

And how was seeing her son for the first time?

"When he finally was placed into my arms, I looked into his precious eyes and felt an overwhelming, unconditional love," she writes. "I felt a huge sense of accomplishment.  'We did it! We did it together!' He and I. I never felt so complete and empowered in my life."

Becoming a mother makes her appreciate the dedication of her own mom, Vânia Nonnenmacher.

"My mom devoted her entire life to her family and did it with such grace," she writes. "She couldn’t have been more of a loving and caring mother. She is the reason why I believe that a woman is the core of a family. I can only hope to be for my kids what she will and always be for us."