Olivia Wilde insists she is ''not in perfect shape.''

The 30-year-old actress, who welcomed 11-month-old son Otis into the world last April with fiancé Jason Sudeikis, says she felt like the ''walking wounded'' after giving birth and her body is now ''softer'' than ever.

The 'Longest Week' star said: ''After giving birth, I joined the ranks of millions of new mothers when I moaned, 'Why do I still look pregnant? Is there another one stuck in there?'

''I am not in perfect shape. In fact, I'm softer than I've ever been, including that unfortunate semester in high school when I simultaneously discovered Krispy Kreme and pot.''

In a personal essay for the April issue of Shape magazine, she added: ''The photos of me in this magazine have been generously constructed to show my best angles and I assure you, good lighting has been warmly embraced. The truth is, I'm a mother, and I look like one.''

The 'Drinking Buddies' star was surprised when she went into labour early, but admits she can't wait to have another baby.

She said: ''[Otis came] two weeks earlier than expected - an extreme adventure that is definitely not for the faint of heart. That day was wild, but weirdly I can't wait to do it again.

''I loved being pregnant. I felt unapologetically curvy, sexy, and intensely feminine. My experience was great, largely because I stayed very strong throughout. Pilates became a healthy habit, which helped me avoid common pregnancy woes like sciatica.''