Olivia Wilde in Little Black Dress Pictures

Birthday girl Olivia Wilde is undoubtedly one of our favorite style-setters — the actress, producer, and philanthropist isn't one to shy away from dramatic dresses on the red carpet (remember the stunning Marchesa gown she wore to the 2011 Golden Globes?) — but she also seems to have a soft spot for the classic, quintessential black dress. When it comes to dressing up, Olivia isn't afraid to take risks with cutouts, open backs, or shorter hemlines, but she looks just as comfortable keeping things sleek and sophisticated in a full-length gown or ladylike pencil dress. In honor of Olivia's 29th birthday, we're celebrating with a look at her captivating and not-so-basic black dress looks over the years; click through to see them all now!