While her husband was on the stage performing, she was in a nearby tent that wasn't far from Mandalay Bay Resort and Casino, where gunman Stephen Paddock fired down onto the crowd from the 32nd floor.
On Wednesday, Brittany -- who is pregnant with the couple's first baby together -- opened up about the terrifying experience in a post on Instagram.
"It's been hard to process what happened the other night," Brittany wrote. "Still feel like I'm in a daze. First and foremost, THANK YOU to the first responders. It amazed me at the time and still continues to -- these people completely put everyone else's lives before theirs and we are all forever grateful."
"When the gunfire started, I was not with Jason, but with some friends in a tent closer to Mandalay. As you can imagine my first instinct was to run to him and his was the same," she continued.
"As we laid behind equipment onstage with some of our road family, bullets flying past... all I could think was 'I never even got to hold my baby,'" said Brittany.
Her note went on: "We all made sure the others knew we loved them and then ran for over where we stayed for the next couple hours. (Not knowing if there were multiple shooters, where the bullets were coming from... NOTHING). We were the lucky ones. I can't put into words the pain and heartache we feel for the ones who are longer with us. May God be with their families and friends during this horrendous time. Each and every one of you are and will forever be in our prayers."
