Khloe Kardashian and Tristan Thompson are once again fueling rumors that they might be back together! The pair attended a pal’s birthday party together this week, and NBA star, Jordan Clarkson, posted a video on his Instagram Story that showed them looking quite close during the celebration. The video showed the group singing “Happy Birthday,” and Tristan noticeably had his arm wrapped around Khloe’s waist when the cameras flashed to the pair.