It has been some time since the reality star and basketball player called it quits on their tumultuous relationship, but they remain committed as ever to co-parenting their 1-year-old.
And True's birthday celebration on Sunday certainly proved that the parents are more than capable of coming together for the sake of their daughter.
"Khloe was very happy that Tristan showed up," a source tells E! News. "The day was a success and drama free."
Another source acknowledges that the party was a "difficult place for Tristan to walk into," so the fact that the basketball player came made Khloe "very happy for True."