And while the birthday girl was certainly floored by the romantic proposal at San Francisco's AT&T Park, she looked picture perfect for her big moment.
The star wore a gorgeous blue and white patterned Valentino dress featuring delicate beadwork, demure long sleeves and an elegant high neckline for a classy look that was stylish and sophisticated.
The feminine design was a part of the fashion house's fall 2013 collection and was a sensational hit on the runway in Paris.
A rep from the label tells us, "The dress is a Mikado embroidered dress that retails for $9,900 and is currently available in all Valentino boutiques."
Moreover, the gorgeous frock has been a favorite of other fashion insiders in recent months.
Designer Charlotte Ronson stepped out at the Brazil Foundation Gala in New York City in the design, pairing it with a touch of bright coral orange lipstick, satin black platform pumps and an ivory box clutch.
Similarly, Lea Seydoux also wore the dress to the Cannes Film Festival, but opted to accessorize with strappy silver Jimmy Choo sandals and soft, natural makeup.
It goes without saying, this beautiful Valentino dress was meant to be noticed, and Kim couldn't have picked a better ensemble for her celebratory night!