Maksim Chmerkovskiy and his former fiancee Karina Smirnoff attended the same event last night and the tension between the two was fierce!

Maksim and Karina both showed up at the TV Guide Magazine Hot List Party at the Beverly Hills SLS Hotel Tuesday night.

“We don’t speak and most likely never will… to me, she is just a person,” Maksim said. “I was happy to be around my friends and quite frankly, didn’t even notice she was there!”

Guess the two Dancing with The Stars pros don’t have much more in common than that anymore!

Damn that’s cold. What the hell happened? A month ago they were engaged.

Maksim Chmerkovskiy and Karina Smirnoff may have looked fab onstage, but things weren’t quite in step behind the scenes.

An insider reports the ex-couple exchanged some heated words before and after their performance.

“They were going at it, screaming at each other,” an eyewitness tells me. “He said she was taking too long in hair and makeup. It got kind of loud.”

Backstage at the Lipton Green Vitali Tea gift lounge, questions about the breakup were off-limits, but Karina said she couldn’t be happier with their dance routine…

“It was nerve-racking, especially when we heard the announcer say, ‘From Dancing With the Stars…,’ ” Karina just told me. “My heart jumped out a couple of times, but then I was like, ‘Enjoy this because how often do you get to perform at the Emmys.’

“And then it just felt like it went very fast,” she continued. “I wanted to do it a couple of more times to really get into it.”

What she did really get into was the swag. Karina checked out products from Nespresso, Palm Pixi, FlipMinoHD, AMC and the very expensive Santoni shoe line.

Who was the idiot that thought these two should appear together after a nasty breakup? Give hiim a raise…great TV!