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Her bun in the oven must have wanted a sweet roll!

Rachel Bilson grabbed some goodies at Belmont Bakery in Studio City after doing some shopping at Earth Baby, and it seems she's already in full nesting mode!

The actress looked petite and adorable in a white tee and grey maxi skirt, and if you look at her front behind you can't even tell she's got a baby on board! Some women are lucky and only gain weight in their tummy, and she appears to be one of those!

The former O.C. star recently gushed about her baby daddy Hayden Christensen, and it sounds like she chose a good man to start a family with!

"He's so incredibly supportive and considerate. It's so basic - that should be there. Because these things are so much more important when you're older. I've been in my relationship for seven years, so we've grown up together in a way. This is my partner, my support, just there for me no matter what. And vice versa," she explained to Health magazine.

This is going to be one genetically blessed child!