The pair was first spotted together leaving the Bootsy Bellows nightclub in Beverly Hills.
Just a week after their initial sighting in Beverly Hills, Tristan and Khloé were photographed spending their Labor Day weekend in Cabo.
Khloé posted this adorable 'gram of two hands (hers and Tristan's, most likely ...) wearing rings bearing Tristan's NBA team's (the Cleveland Cavaliers) emblem.
Later that month, they also reached a major relationship milestone when they pulled off coordinating Halloween costumes.
Kardashian told Jimmy Kimmel that she spends a lot of time in Cleveland (Cavaliers country).
Khloé and Tristan celebrated Christmas and rang in the New Year together.
The pair went on yet another tropical excursion, this time to Jamaica.
Khloé threw Tristan the golden birthday celebration of our (and probably his) dreams.
Khloé told ES Magazine that she and Tristan had already discussed having kids. "We’ve talked about it," she explained, "He [already] is a father, and I know for a fact that he would be an impeccable father. I definitely want to be a mom. But I don’t put the pressure on it. It’s not like, 'the clock is ticking.' I feel in my soul it will happen."
Tristan threw Khloé an extravagant surprise birthday party.
In an episode of KUWTK, Khloé revealed that she's off birth control and that Tristan wants them to have "five or six kids" together.
Reports of Khloé’s pregnancy surface—but nary a Kardashian nor Jenner would personally confirm the news.
Amidst rumors, Khloé and Tristan celebrated another epic Halloween together, dressed as Game of Thrones' Daenerys Targaryen and Khal Drogo, respectively.
After what felt like a lifetime, Kardashian finally confirmed her pregnancy with Thompson's child in a heartfelt Instagram post.
"Mum and Dad" celebrated their last New Year's Eve before welcoming baby Thompson.
The pair spent a picture-perfect Valentine's Day together.
It's a girl! The sex of Khloé and Tristan's baby was finally revealed—later that month, the whole clan celebrated with an appropriately pink shower.