Reese Witherspoon was all smiles hanging out with her eldest son, Deacon Phillippe, in Santa Monica, CA, earlier today. Reese gave birth to her third child, Tennessee James Toth, just three weeks ago, and she appears to be back in the swing of her busy weekday routine. For her latest outing, Reese had Deacon along to help her pick out a few things at Gap and then join her for a a midday Jamba Juice snack.

Reese seems to be picking up right where she left off while balancing life with a newborn. Tennessee's arrival hasn't slowed work at her production company, Pacific Standard. In fact, new rumors suggest they company is currently developing a version of Great Expectations for television. Additionally, Reese and her production team won the film rights to Gillian Flynn's bestselling novel, Gone Girl. Casting is in the early stage, but tell us who'd you like to see play Nick and Amy on the big screen!

Cameron Diaz settled back into LA life with a trip to Gucci in Beverly Hills today. The actress looked effortlessly chic in a white tank top, jeans, and a sweater, as she carried a Céline purse on her arm and a Gucci bag in her hand. This was a second shopping stop in Beverly Hills this week for Cameron, who visited a Maison Martin Margiela outpost on Monday.

Cameron is taking advantage of some free time after an extended trip to London, where she worked on The Counselor alongside Brad Pitt, Penélope Cruz, and Javier Bardem. Before her return to the West Coast, she stopped off in NYC to celebrate her friend Gwyneth Paltrow's 40th birthday. The two blond beauties also paired up to show off their funny sides with a rap video for Chelsea Lately that went viral last week.

Ben Affleck got a taste of Italy last night during a break from promoting his current feature, Argo. He met up with friends for a bite to eat at Rome's Il Bolognese on the same night Kim Kardashian and Kanye West also enjoyed a romantic meal.

Ben's currently in Europe chatting with press about his latest directing project, and in addition to work duties he's also managed to fit in some quality time with Jennifer Garner. Jen joined Ben for a quick trip to Paris, where the two were spotted holding hands and cuddling close in the French capital. From Paris, Jen returned home to LA and their three little ones, Seraphina, Violet, and Samuel, while Ben continued on to his next stop, London. Ben's CIA thriller is gaining momentum at the box office, but new films are also battling for the top spot, with Paranormal Activity 4 and Alex Cross opening today.

Mary-Kate and Ashley Olsen stepped out for a sisterly day of shopping in the SoHo neighborhood of NYC today. The 26-year-old twins were both dressed for a chilly Fall day, with Mary-Kate in a black furry coat and boots and Ashley in white stripes and flats.

Last night, Mary-Kate and Ashley attended WSJ. Magazine's Innovator of the Year awards alongside celebrities including Julianne Moore. The ceremony was held at NYC's Museum of Modern Art, and the sisters' clothing line The Row was recognized for being this year's fashion innovator. Mary-Kate and Ashley celebrated last night's win with a girls-only trip today, but earlier this month they were spotted having lunch with Mary-Kate's boyfriend, Olivier Sarkozy. Things seem to be heating up for the couple, and there are rumors circling that Mary-Kate and Olivier might move in together soon.

Elisa Donovan married businessman Charlie Bigelow in a beautiful sunset ceremony at the Carmel Valley Ranch in Carmel, CA, on Oct. 13. The bride, who gained fame for her role as Amber in Clueless and will be on the small screen in The Dog Who Saved the Holidays this Fall, wore an Elizabeth Fillmore gown and Jimmy Choos while her groom was suited up in Burberry. Elisa and Charlie, who have been together since meeting three years ago in Sayulita, Mexico, celebrated with about 150 family and friends, including True Blood's Sam Trammell and his longtime girlfriend, Missy Yager. The couple's 5-month-old daughter, Scarlett Avery, was also part of the nuptials. Congrats to the newlyweds!

Ben Affleck was up early in Rome this morning to do press for Argo at a promotional event. He's taking the CIA thriller around Europe, having done interviews in Paris over the weekend and debuting it in London Wednesday night. His wife, Jennifer Garner, was able to keep him company in France, but she's since returned to their home in LA. Yesterday, Jen and their middle child, Seraphina Affleck, ran errands together. They wrapped up the afternoon with friends at a pumpkin patch. Jen and Sera picked up pumpkins to being home to siblings Violet and Samuel, too. Sera had a solo ride on a pony, but joined Jen for a ride on a minitrain.

Last night, we opened the doors to our brand-new LA studios with a live performance by none other than Ellie Goulding. The British pop singer performed tracks from her debut CD, Lights, and her new album, Halcyon, which is garnering both critical praise and lots of love from her fans. She sang stirring, stripped-down versions of songs including "Starry Eyed," "Lights," and my personal favorite, "My Blood," for the crowd, kicking off the first in what will be a series of PopSugar live music showcases. I had a chance to interview Ellie in between sets, and we talked about why growing up in the countryside helped her develop her unique sound, her upcoming collaborations with boyfriend and fellow artist Skrillex, and why writing Halcyon didn't go exactly as she'd planned.

If you missed last night's show, or just want to watch it again, not to worry: Ellie Goulding's live PopSugar performance and interview is replaying now. We're looking forward to bringing you more great performances like Ellie's in the future, so stay tuned for our next artist announcement. In the meantime, click through to see all the snaps from last night's bash.