While most of us were anxiously waiting to see if the shamed playboy would acknowledge Koko and her efforts with their 13-month old daughter, True, there was silence on his end. Perhaps his refusal to address the mother of his second child proves they are no longer on speaking terms?
While it was no doubt a subtle dig at Khloe, it didn't seem to bother the mum-of-one who spent her first Mother's Day with their daughter.
Taking to Instagram, Khloe shared a few videos of the pair giggling and smiling together as True sat in her high chair and babbled the word 'mum'.
WATCH: Khloe and True on Mother's Day
Tristan also forgot to pay tribute to his first baby mamma, Jordan Craig, who he shares two-year-old son Prince Oliver with.