NOT SO FAST! Tristan Thompson ‘mistress’ Sydney Chase slams reports NBA star is suing model for claims he cheated on Khloe Kardashian Exclusive 5 May 2021, 0:38 TRISTAN Thompson's alleged mistress, Sydney Chase, slammed reports the NBA star is suing her after she claimed he "cheated" on Khloe Kardashian, The Sun can reveal. Earlier today, the Boston Celtics player called the 23-year-old a “liar" for alleging to having a months-long sexual relationship while he was dating the KUWTK star. �� 14 Sydney Chase slammed Tristan's claims he is 'taking legal action' against the modelCredit: Instagram/ Sydney Chase 14 14 Khloe Kardashian confronted Sydney following his latest cheating allegationsCredit: E!