When you know, you know!

In honor of Valentine's Day tomorrow, Khloe Kardashian is opening up about her relationship with Tristan Thompson. The pregnant Keeping Up With the Kardashians star took to her website Tuesday to answer the fan question, "How do you know that you've found 'the one?'"

"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," the mom-to-be gushed on her official app. "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."

Khloe Kardashian, Tristan Thompson

Seth Browarnik/startraksphoto.com

As it turns out, Khloe and Tristan had a ton in common.

"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," she continued. "We shared the same principles and morals. 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."

Khloe adds, "That being said, you cannot fake the energy or chemistry that you have with someone. That means more to me than any conversation. But you need that foundation for when the honeymoon phase is over. You still must have respect and a mutual love for one another."

Too cute!

Watch a brand new episode of Keeping Up With the Kardashians Sunday at 9 p.m., only on E!

Check out Khloe and Tristan's cutest pics below!

Khloe Kardashian, Tristan Thompson, Pregnant, Baby Bump, 2018 NBA All-Star Weekend Party

Getty Images for Rémy Martin // Jerritt Clark

Tristan rubs Khloe's baby bump at the Klutch Sports Group's More Than A Game dinner, presented by Remy Martin at Beauty & Essex in Los Angeles. There, they posed for their first publicity photos together.

Khloe Kardashian, Tristan Thompson

Instagram

Kardashian captioned this Instagram snapshot, "The day I met you, my life changed. Thank you my love!"

Khloe Kardashian, Tristan Thompson

Instagram

The couple seals their love with a poolside kiss. 

Khloe Kardashian, Tristan Thompson, Instagram, 11-17-17

Instagram

KoKo hugs the NBA star close during her surprise 33rd birthday celebration. 

Khloe Kardashian, Tristan Thompson, Snapchat

Snapchat / Tristan Thompson

The soon-to-be parents spend some down time together. 

Khloe Kardashian, Tristan Thompson

Instagram

The lovebirds totally nail their Game of Thrones-inspired Halloween costumes. 

Khloe Kardashian, Tristan Thompson

Snapchat

Before the E! reality star confirmed her pregnancy, she fueled baby speculation with this set of lovey-dovey photos captioned "Dad + Mom."

Khloe Kardashian, Tristan Thompson

Instagram

Khloe posted this sweet PDA pic of the couple over the summer. How cute are they?

Khloe Kardashian, Tristan Thompson

Instagram

Khloe posted this pic of herself and Tristan in matching outfits. "Sweet Sunday," she captioned the photo.

Khloe Kardashian, Tristan Thompson, Cutest Moments

Instagram

The Cleveland Cavaliers player surprised his leading lady with a star-studded party in honor of her 33rd birthday. "Im so lucky and blessed! Thank you so much baby!!!" she tweeted. "You treat me like a queen!"

Khloe Kardashian, Tristan Thompson, Cutest Moments

Instagram

The reality star and athlete rang in 2017 together with an intimate groove on the dance floor. "Happy New Year!!! May you always be surrounded by the love you are deserving of!" she wrote on social media at the time. "May Gods blessings continue to rain on us all."

Khloe Kardashian, Tristan Thompson

Instagram

For Tristan's 26th birthday, Khloe threw her boyfriend a gold-themed soirée. "To the happiest of birthdays my love! To the first of many more together!" she wrote on Instagram. "May God continue to bless you in all of your days! And may we forever look at one another like this."

Khloe Kardashian, Tristan Thompson

Instagram

Khloe and Tristan showed they were on the same page when they stepped out in matching furs. 

Khloe Kardashian, Tristan Thompson

Snapchat

For one of their first vacations as a couple. KoKo and her baller beau strapped on helmets and went zip-lining in Jamaica

Khloe Kardashian, Tristan Thompson

Instagram

Despite their coordinating camouflage, there's no disguising the hearts in their eyes they have for each other. 

Khloe Kardashian, Tristan Thompson, Halloween, Kissing, PDA

Instagram

For their first Halloween together, the duo dressed as one of the comics' signature pairs. 

Khloe Kardashian, Tristan Thompson

Seth Browarnik/startraksphoto.com

There's no better look of love than two wide grins!

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