The pair – who share one year old daughter True – called time on their relationship early last year amid Tristan’s cheating scandal.
He had shared a kiss with Jordyn Woods, Khloe’s sister Kylie’s former bestie.
But now it’s reported the pair have rekindled their romantic spark and are looking to take their relationship to the next level.
An insider told heat that Khloe and Tristan have been planning a “low-key, intimate ceremony with just a few dozen people”, which would ideally take place at sister Kim’s place.
Now that Khloe’s mansion is reportedly on the market for a cool $19 million, the source added that Kim’s “LA mansion is the perfect venue for an outdoor wedding.”
They added: “The plan is to set up an altar with a custom-made gazebo. There’ll be a big tent put up for the reception and a few cameras, of course.”
Fans had speculated that Khloe and Tristan might have renewed their relationship as Tristan isolated with her and daughter True amid coronavirus.
Kim last week claimed that Tristan was “trying really hard” and that he’s “a different person.”
And Kim is said to have a starring role in the ceremony – as well as hosting, she’s “helping with everything from the hand-written vows to the dress, to the honeymoon.”
Mirror Online has contacted reps for Khloe, Tristan and Kim for comment.
As rumours of a reunion swirl, Tristan added fuel to the fire by penning a touching note for his ex to mark her 36th birthday.
The 29 year old wrote: “I’m wise enough now to know, you came into my life to show me just what it means to be an incredible person.
“I appreciate how I am able to learn from and grow because of you.
“I thank God for the beautiful and loving woman you are to everyone, especially our daughter True.”
It transpired last year that Tristan and Jordyn had locked lips at a party – and that Jordyn had lied to Khloe when she said she’d gone to the party to make sure Tristan didn’t cheat.
Khloe soon ditched him, following his second count of infidelity – he was embroiled in a cheating scandal when she was pregnant with True.