Khloe has flown to Toronto to be by her ex-boyfriends' side.

The former couple were spotted together deplaning a private jet.

Sources say KK joined TT to provide comfort and support during such a difficult time.

You may recall, Khloe lost her father, Robert Kardashian Sr., when she was a young adult.

She took his death extremely hard.

Khloe and Tristan have not reconciled as a couple, but they do co-parent their two children.

TT has been spotted at family gatherings and parties.

The Good American co-founder has praised Tristan for his hands-on parenting, but can't say that for him being a faithful, monogamous partner.

In 2015, her ex-husband, Lamar Odom suffered a near fatal overdose and she rushed to be by his side then, and even aided him throughout his recovery.