Khloe Kardashian has said ''forgiveness'' is the key to her relationship with Tristan Thompson.

The 33-year-old reality star is currently expecting her first child with the NBA star, and on Tuesday (27.02.18) she took to her app to share with her followers her personal opinions on how to maintain a successful partnership with a significant other.

She wrote: ''[It] really depends on what you value in your own life and consider good. Allowing one another to evolve and grow and allowing yourselves to miss one another [are important factors].

''[It's about compromise]. That doesn't mean you're weak. It means you're growing up. Forgive quickly and honestly. Be vulnerable and open about love.''

It comes after Khloe recently revealed she knew Tristan was the one ''very quickly'', as she felt ''comfortable and safe'' with him straight away.

She said: ''My answer for this probably doesn't apply to everybody, but I knew Tristan was the one very quickly - I have never felt so comfortable or so safe with someone. Because of that, I took it very slowly and was cautious about how I went about 'us'. I made sure we had very in-depth conversations. I wanted to make sure that those conversations were backed up by actions.

''Tristan was so forthcoming with his life, as I was with mine. It was really reassuring to feel that someone had the same belief systems as I did. We spoke about religion, children and our families. I think all of those things are important to truly know the ins and outs of someone. It's really easy to fall in love with someone during a honeymoon phase when you haven't yet discussed the logistics of life. But you have to talk about the real things if you want a real/long-lasting relationship.''

The 'Keeping Up with the Kardashians' star and her 26-year-old beau are closer than ever as Khloe nears the end of her pregnancy, and Khloe recently praised Tristan for making everything ''as easy and beautiful as it can be''.

She said: ''Having a partner that is equally as excited as you are, and is such a support system, is crucial! Tristan has been an angel to me! This process is trying - physically and mentally - but Tristan has made everything as easy and beautiful as it can be! More than I could have imagined.''