Fans can’t help but wonder whether the parents secretly engaged with a diamond ring on Khloe Kardashian’s finger and enhanced quality time with Tristan Thompson. While it was hard to ignore the glamorous rock on Khloe’s ring finger in pictures from her 36th birthday party — which Tristan also attended on June 27 at his ex’s Calabasas home. “Khloe and Tristan are not engaged despite the rumors about their relationship,” says a source close to Khloe.