WHITE ON: A stylish crowd packed into Rebecca Taylor’s Robertson Boulevard boutique Thursday evening to toast the designer alongside co-hosts actress Sarah Michelle-Gellar and stylist Tara Swennen, for the launch of her Little White Dress Collection. A family trip to Turks and Caicos inspired Taylor to design the nine-piece capsule, which retails from $325 to $395 and is available in all eight of her boutiques as well as department and specialty stores. Having left hubby Freddie Prinze Jr. at home with the kids, Gellar sparkled in a jewel-embellished white number and praised the designer, whom she first met when Taylor was “just a Kiwi girl that people didn’t know about.” Also in attendance were actresses Kaley Cuoco, Bree Turner and Ashley Jones. Cuoco talked candidly about her new husband, tennis pro Ryan Sweeting, saying that they had babies on the brain. “Well being at this Baby Buggy event… We both want to be parents so bad, we can’t wait,” the “Big Bang Theory” actress gushed, “So hopefully it’ll happen.” The designer was also joined by her mother and two sisters, who were visiting from New Zealand for a “girls week” in Los Angeles.