Showdown! Inside Blake & Miranda's Awkward Awards Show Run-In

Miranda Lambert and Blake Shelton divorced nearly a year ago, but apparently the split still stings! RadarOnline.com has learned the couple had a frosty night at the 51st Academy Of Country Music Awards on Sunday.

They former couple both appeared in Las Vegas for the show, but while Lambert, 32, flaunted her new relationship with Anderson East, it was her ex that she was focused on throughout the night.

"Miranda completely stayed away from Blake the whole time he was there," an eyewitness told Radar. "She completely avoided him."

She and Shelton, 39, split up in 2015, which she called a "sh***y year," and he quickly rebounded with The Voice costar Gwen Stefani, who did not attend the show with him.

Shelton performed his new song "Came Here To Forget," which is about his split from Lambert and finding new love with Stefani.

But Lambert didn't acknowledge the sting, instead choosing to show off her new man, East.

"She made it a point to tell everyone he was her boyfriend, and she was very affectionate with him," the source told Radar.

While Lambert and Shelton have been friendly on social media following their split, they certainly didn't have a love fest in Vegas.

"Miranda went to the Four Seasons after-party but Blake wasn't there," the source explained.