Khloé Kardashian and Tristan Thompson are "giving their relationship another try" following Khloé's 36th birthday bash.WATCH BELOW: Khloé Kardashian reveals Tristan might be her sperm donor According to PEOPLE magazine, the couple, who share two-year-old daughter True, are getting back together."Tristan is working hard to prove himself and has been a great dad to True," the source revealed.The 29-year-old basketballer, 29, was present at Khloé's birthday party along with her mum Kris Jenner,