Samantha Ronson

Nicole Richie threw on a studded leather jacket for an appearance in LA yesterday. She stopped by Milk Boutique to support pal Masha Gordon at her If Pockets Talked pop-up shop, where Samantha Ronson DJed. The evening out was just the latest in a string of events for Nicole, who also attended Mindy Kaling's book launch party at the Roosevelt Hotel on Monday. Over the weekend, Nicole hosted a Winter Wonderland event with Baby2Baby and also dressed up for the MOCA Gala. She was just one of many famous faces at the glamorous museum night, including Gwen Stefani and Rachel Zoe.

Nicole Richie rocked a bikini in Cabo San Lucas on Friday. She was in a strapless black two-piece to lounge by her hotel pool with a similarly swimsuit-clad Samantha Ronson. The girls also showed some skin Saturday during a jaunt to the beach. They're south of the border, hanging out with other pals like Jessica Simpson and Ashlee Simpson. Any rumors that Nicole and her Fashion Star cohost Jessica are feuding were put to rest when the girls met up for lunch yesterday. The fun vacation comes just days after Nicole Richie turned 30. We celebrated by looking back at some of her sweetest moments with pals, and it seems those real-life BFFs whisked her away for a couple days of fun in the sun. On the actual day, last Wednesday, Jessica tweeted to Nicole, "Happy birthday Nicole Richie! Today don't feel guilty about mixing your pressed green juice with vodka. Huge hug and boobie bump!"

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."

Nicole Richie and Paris Hilton shared a laugh at a party to celebrate the launch of Charlotte Ronson's latest I Heart Ronson line for JC Penny at the Roosevelt hotel in LA last night. The former The Simple Life costars are rarely photographed together in recent years, though this makes two nights in a row for Paris and Nicole as they both attended the Britney Spears concert on Monday as well. Paris even tweeted to Nicole after the bash using their cutesy nicknames for each other, saying, "Bill, great seeing you tonight at #Iheartronson. You looked so beautiful! Love you. Love Sill xoxo." Paris was home in time to watch herself on Lopez Tonight, and overall she seemed to be in good spirits despite confirming her split from boyfriend Cy Waits earlier in the day. Ashlee Simpson also attended last night's soiree amid her own love life rumors. Ashlee Simpson was spotted kissing Vincent Piazza and holding hands with the Boardwalk Empire star during an outing in NYC last week.

Nicole Richie cozied up to her husband, Joel Madden, last night at the Vans X Jessie Jo launch party at LA's Troubadour. The parents of two partied alongside Joel's brother, Benji, as well as pals like Samantha Ronson and even Cher. Nicole wrapped up her daily stint at the gym to attend the bash, and she showed off the products of her hard work in a spread for the upcoming The Block magazine. She also teamed up with her trainer, Tracy Anderson, for a new video showcasing the dance fitness method they both love. Joel got in on some taped fun recently as well by creating a piece for Funny or Die.

Nicole Richie's little sister Sophia carried Harlow yesterday afternoon while out in LA with Lionel Richie. The family checked out a spectacular show called Cavalia after Nicole's busy Saturday — she was solo to hit the gym wearing Nike, then showed off her legs in a little red dress to go out dancing at Ultra Suede with Samantha Ronson. Nicole had the help of Ken Paves to get fancy for a recent Harper's Bazaar Russia photo shoot, which came on the heels of her feature in the February issue of Lucky. She's out and about doing press for her new Winter Kate collection, yet somehow finds time to also work on another novel.