Credit: Charley Gallay/Getty

Ever since Nicole Richie andlongtime boyfriend Joel Madden announced their engagement, we've been awaiting details (designer? style?) on the bride-to-be's wedding dress. Despite tabloid reports that Richie chose a Monique Lhuillier gown (the same one Molly Malaney wore on The Bachelor wedding!), the real story is that the busy fashion designer and mother of two hasn't had a minute to think about it. "I have not decided on a dress," she told us at last night's Missoni dinner in Beverly Hills. "I haven't even thought about it!" Richie, who recently launched her contemporary line Winter Kate and a new shoe collection for House of Harlow, looked chic (and perfectly bohemian) in a floor-length Missoni halter dress that she "threw on" last minute. "I got ready really fast. I pulled this out of my closet—it's my own personal Missoni. I forgot I had this and I haven't worn it," she said. "It turned out to be perfect!" Talk about truly effortless style!

Enid Portuguez, with reporting by Lindzi Scharf