Baby, it's cold outside!

Blake Lively and Ryan Reynolds bundled up and headed into New York's Nobu 57 on Monday evening.

The couple – who live just outside the city in quaint Bedford, N.Y. – entered the Robert De Niro co-owned restaurant wearing their winter best.

"They were both dressed casually. [Ryan] had a knit hat on and a few days' worth of facial hair," an onlooker tells PEOPLE.

Upon walking into the restaurant, Lively, who wore a "cute bright green puffer jacket," was "doing something with her phone," the source adds.

Two and a Half Men star Ashton Kutcher reunited with his That '70s Show costar Danny Masterson for a boys' weekend in San Diego. The guys, along with Danny's brother, Chris, partied at Fluxx Nightclub, holding court at a VIP table where they enjoyed cocktails and scoped out the scene. Kutcher and his pals were staying at the Hard Rock Hotel, where they also dined at Nobu before clubbing.

New parents Pink and Carey Hart took daughter Willow with them to dinner at Nobu Malibu. The singer led the way as they arrived, and her husband followed, carrying the baby. The two settled into a patio table, but not before passing actor Balthazar Getty, who was dining with his kids. Hart was very attentive to their daughter, according to an onlooker, and the two seemed to enjoy their time out together.

• What a good stepmom! LeAnn Rimes enjoyed a shopping outing at the Malibu Country Mart with hubby Eddie Cibrian's boys Mason and Jake. The country singer, in leopard print shorts, browsed the stores – and even ran into actor Gary Busey and his girlfriend. Later in the day, Rimes returned to the Mart – this time with her hubby for a romantic meal at Nobu.

Chord Overstreet and Emma Roberts enjoyed a romantic weekend in the Hamptons together. On Friday, they helped Andy Roddick celebrate the launch of his new Lacoste tennis fashion line at Nobu at Capri in Southampton, N.Y. The next day, the couple hit up the sales during a shopping trip at the Super Saturday 14 Benefit for the Ovarian Cancer Research Fund in Bridgehampton, N.Y. The pair, who sported similar shades also rode a Ferris wheel together.

In town for Comic Con, Kristen Stewart and Robert Pattinson chatted up Justin Timberlake at Nobu inside the Hard Rock Hotel San Diego. The Breaking Dawn duo kept a low-profile as they dined on Japanese food and went relatively unnoticed.

Real Housewives of Orange County's Gretchen Rossi and beau Slade Smiley joined friends at Hard Rock Hotel San Diego's Intervention Pool Party, where they relaxed in a private cabana and sipped cocktails. At night, the two went to Nobu for dinner before heading home to Orange County. The night before their relaxing day, the reality stars celebrated with a friend at her bachelorette party.