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Olivia Wilde and her 3-month-old son, Otis, are featured in September issue of Glamour magazine. In a photo of the magazine, Olivia breastfeeds Otis while wearing a Roberto Cavalli dress, Prada scarf and heels, Yossi Harari earrings, and a Lanvin ring.

Olivia tweeted the screenshot of the picture on August 5, captioning it with, "Otis ordered milkshakes. Luckily I had some on me. Then he peed on my dress. Good kid. #boobfood #whennaturecalls."

Olivia tells the magazine, "Being shot with Otis is so perfect because any portrait of me right now isn't complete without my identity as a mother being a part of that. Breast-feeding is the most natural thing."

"I don't know, now it feels like Otis should always be on my breast," the star of "The Longest Week" continues, "It felt like we were capturing that multifaceted woman we've been discussing-that we know we can be. You can be someone who is at once maternal and professional and sexy and self-possessed. [But] I mean, I certainly don't really look like that when I'm [typically] breast-feeding. And there's usually a diaper involved."

Talking about being a working mother, Olivia does not think it's hard because her mother has given her an example. The 30-year-old actress claims, "My mom is such a badass working mother. That inspired me when I was pregnant. I wasn't going to sacrifice myself because I was becoming a mother."

When asked about her plan for wedding with her fiance, Jason Sudeikis, the "Third Person" star replies, "We're engaged, but no specific plans yet-we just have to find the time to put it together. In many ways, a child is more of a commitment. We are fully committed and really happy as a family. And there's no definition of the 'normal family' anymore. Kids today are growing up with so many different definitions of family. I guess what I'm saying is that I don't feel any pressure to do it. But I think it will be really fun."

Before getting engaged to Jason, Olivia was married to Italian filmmaker Tao Ruspoli in 2003 but they divorced in 2011. Talking about her past marriage, the "Tron Legacy" actress says, "[I] wouldn't be this person without that first marriage. I really grew up with my first husband."

"Now I'm in a much wiser, more centered place in life," the "Better Living Through Chemistry" actress adds, "I think if we can see people in our lives as chapters, we have a much healthier perspective about the whole thing. It's like it had to happen the way it happened. Jason and I lived two blocks away from each other for years and never met."

Otis ordered milkshakes. Luckily I had some on me. Then he peed on my dress. Good kid. #boobfood #whennaturecalls pic.twitter.com/YC9OcJuRod

— olivia wilde (@oliviawilde) August 5, 2014