Jessica Alba, Nicole Richie, and Rachel Zoe dressed up Saturday to attend their mutual friends Katherine Power and Justin Coit's wedding reception at LA's Mr Chow. Nicole had her husband Joel Madden on her arm after an ice cream run with their daughter Harlow earlier in the day, while Rachel arrived with Rodger Berman but not their baby Skyler. Rachel's experience with her 3-month-old son has taught her a lot, and she's already sharing fashion tips for new moms. Jessica, meanwhile, dressed to accommodate her growing baby bump, and looked gorgeous in a blue strapless number alongside Cash Warren. The bride, Katherine, picked two dresses for her big day, and kicked things off in a short number customized from Rachel's upcoming debut collection. Jessica was moved by the ceremony, and tweeted, "Amazing and beautiful couple Justin Coit and Katherine Power — we had an incredible night celebrating your everlasting love." Nicole had kind words to share too, writing on Twitter, "Congratulations to the new married couple Mr. and Mrs. Coit!" Katherine was appreciative of all the well wishes; the newlywed had thanks to share after the ceremony, posting, "We are lucky to have such amazing family and friends."