Olivia Wilde
Credit: Karwai Tang/WireImage

When it comes to love, Olivia Wilde, who rings in her 31st birthday today, seems to have it made. The actress, who is mom to adorable son Otis and wife to funnyman Jason Sudeikis, shared what she's learned over the years when it comes to relationships and falling in love. In her August 2013 cover story of InStyle, The Lazarus Effect star gets candid about why her relationship with Sudeikis is so successful.

"I like having a real partner. It's the model I grew up with. It's part of why I was able to take so many chances in my life, because I felt like someone was watching my back. I could never imagine life without someone I respect, someone who offers me infinite possibilities," she says.

And Wilde is willing to take on the challenges that come with having two performers in a couple. "There are spikes and dips and plateaus in this business. I've seen couples fall apart through it, and it is heartbreaking. You wonder what will happen—will he love me if I’m not as successful? Will jealousy kill us?" she says. "I know there will be times when Jason is working more than I am, but I’m actually excited by that. I’m excited by what he will become, what depth he has."