So how does the married, self-proclaimed sober star let loose?
"Russell was hanging with a tall guy pal and munching on some easy Mex bites," an eyewitness at the Lime restaurant in South Beach dishes to us. "He was totally low key and cool in that Brand way of his."
When did the reformed party boy and ladies man become so totally boring?
Earlier in the week, Brand was spotted at Soho House in West Hollywood chowing down with a male pal.
"He had at least four dishes all to himself," an eyewitness at the posh private club tells us of the hungry star. "He was eating a late dinner with a male friend. A woman joined their table mid-meal, but it looked like they were discussing business."
Craving a hipper scene was...
Christian Slater, who was also spotted getting his grub on. We caught the actor at The Forge restaurant in Miami Beach breaking fancy bread with Burn Notice actress Gabrielle Anwar and her beau, Shareef Malnik, who owns the joint.
According to our spy, "Christian looked happy and oh-so-young and was deep in conversation with power attorney/philanthropist Jim Ferraro."
Festive back on this coast were Dancing with the Stars pals...
Kendra Wilkinson, Hank Baskett, Kirstie Ally and Lacey Schwimmer, who all came out to this week to celebrate Cheryl Burke's 27th Birthday at BoHo Gastropub in Hollywood.
"All the ladies were sipping on Leblon Strawberry Basil Caipirinhas," says a source of Cheryl's special birthday drink.
And in case you've been wondering where...
Jenna Elfman has been, we caught the actress enjoying a private dinner at NINETHIRTY restaurant in the W Los Angeles-Westwood hotel prior to honoring Julie Andrews at the Geffen Playhouse's annual fundraising gala.
So many celebs caught chowing down this week, you'd think they were auditioning for The Hunger Games!