It's practically a law of nature that singers bob their heads when they listen to music with a strong beat. But the bobbing heads of Blake Shelton and girlfriend Gwen Stefani were something to behold on Wednesday night at the CMA Awards show, because they were keeping time to Shelton's ex-wife, Miranda Lambert, singing her newest single, "It All Comes Out in the Wash." They even followed her performance with what could be assessed as something more than polite applause.

It's been more than four years since the couple divorced, which evidently is long enough for an ex to achieve at least normalized celebrity-audience behavior. What's more, Lambert and her husband, Brendan McLoughlin — seated one section over on the front row — later returned the gesture in kind. Their two heads bobbed along, too, when Shelton took the stage for "God's Country," and the two also didn't sit on their hands. Honestly, does it get any more "bygones" than this?

Of course, let's not get carried away: Shelton and Stefani didn't join the majority of the celebrity section, who spontaneously stood during Lambert's performance, nor did Lambert and McLoughlin join Shelton's standing ovation.

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PEOPLE was inside Bridgestone Arena to observe those remarkable sightings — and here are even more glimpses of what happened during the awards show when the cameras weren't looking:

FAST FRIENDS: Reese Witherspoon, Kacey Musgraves and her plus-one, model Gigi Hadid, formed an instant sorority on the front row of the arena and spent commercial breaks in lively kibitzing (and it sometimes included Witherspoon's "Big Little Lies" co-star Nicole Kidman, who was two seats away). Hadid must have taken her "date" role seriously. When the time came for Musgraves to head backstage for her performance, Hadid loyally followed, but who better than a model to help you get ready?

CARRIED AWAY: What did Carrie Underwood, the awards show's indomitable 12-time host, do when cameras weren't watching? She happily waved to the crowd while waiting for her cue. At one point, after delivering an intro, she broke into a run toward backstage — perhaps headed off to her next quick wardrobe change. During another exit, she tripped on one especially diaphanous gown. No worries. She quickly caught herself and kept going.

MODEL CHILD: Willa Gray Akins, the oldest daughter of Thomas Rhett and wife Lauren Akins, came to her first CMA Awards show wearing a gold lame dress and her best behavior. How many other 4-year-olds are content sitting still for more than two-and-a-half hours at a grownup event? Granted, most of the time she was either on her mom's lap or being held by one of her parents, but she exhibited hardly a wiggle. No doubt her favorite performance was her dad's: Along with hundreds in the audience, she waved a cell-phone flashlight from the first note to the last of Thomas Rhett's "Remember You Young." The couple, who are expecting their third daughter, ended Willa Gray's big night out after Luke Combs was announced male vocalist of the year, which Thomas Rhett also was nominated for. (The couple's 2-year-old, Ada James, made her first red carpet appearance, by the way, but was nowhere in sight during the show.)

NOT-SO-MODEL CHILD: And then there was Jameson Hart, the nearly 3-year-old son of Pink and her husband, Carey Hart. He acted every bit the rambunctious boy, escaping from his parents' clutches for some typical toddler horseplay during the show. His appearance on the front row was relatively brief, perhaps to the relief of Dierks Bentley and his wife, Cassidy, who were seated next to the boy.

SWEET CELEBRATION: Shelton had a veritable welcoming committee waiting for him when he returned to his front-row spot after winning CMA single of the year for "God's Country. " RaeLynn, a Shelton protege on "The Voice," was there to give him a tight hug, and after he took his seat, girlfriend Stefani was at the ready with her phone for selfies. Jordan Schmidt and Devin Dawson, two of the song's co-writers, quickly descended on Shelton to celebrate, and once they departed, he and Stefani topped off the moment with a smooch.