Happy 30th birthday, Olivia Wilde! The stunning actress has every reason to celebrate: Not only has she found happiness with her funnyman fiancé, Jason Sudeikis (who gave her a beyond-jaw-dropping vintage emerald-and-diamond engagement ring), but she also has a baby on the way! She’s treating her pregnancy with her own brand of humor, thanking her 1.25 million Twitter followers for their congratulations with this tweet: “WOW. You guys are awesome. So kind. Thank you thank you thank you! PS. Babies eat mostly salsa right?”

InStyle’s August 2013 cover girl—who appeared in the Oscar-nominated Her and is due to appear in upcoming films like the dramedy Better Living Through Chemistry, co-starring Sam Rockwell, as well as the comedy The Longest Week alongside Jason Bateman and Billy Crudup—is also intent on using her voice to make a difference. Wilde started a Crowdrise campaign to benefit Artists for Peace and Justice, which serves the poorest communities in Haiti with programs in education and healthcare.

Wilde is not only funny and philanthropic, she’s also a red-carpet stunner: InStyle named her one of the 10 best-dressed stars at the 2014 Golden Globes for her bump-hugging dark-green Gucci gown. And before she became a mama-to-be, InStyle.com readers voted her A.L.C crop top ensemble at the 2013 ESPY Awards as one of the top 5 looks of 2013. A Revlon spokesperson, she’s also the celebrity face of Avon’s Today. Tomorrow. Always. scent collection.

Celebrate Wilde’s milestone 30th birthday by seeing how much her style has evolved in our gallery!

MORE:• Olivia Wilde's Best Looks Ever!• See Wilde's Baby Bump Style At the 2014 Oscars• Olivia Wilde’s Secret to Glowing Skin

—Serena Kappes