The relatively private couple, who met in middle school, started connecting on a deeper level in high school when they began making music together.
Literally. And down the road, making it in a different sense. If you know what we mean! (We hope you do, and excuse our terrible attempt at humor.)
"Brandon came over one day and was like, ‘I am totally in love with you,'" Leah recalls of Brandon's first move. "I was like ‘No, I can't. I can't.' Okay, fine. Yes."
Hey. Whatever works.
"The fact that we get to work together is just a ridiculously awesome bonus," Brandon Jenner said of the two musicians. "It's just what works for us."
"It might surprise people that we spend so much time together and that we still get along, but it's just the way it is for us. It's the way it's always been."
"The truth is that we are such great friends that we want to be together all the time. We're both passionate about what we're doing, and we love each other."
That they do. More than 10 years later, they are still together and - as evidenced by social media and Keeping Up with the Kardashians - head over heels.
This will be the third biological grandchild for the legendary Bruce Jenner, whose daughter Casey from his first marriage has two little girls to her name.
Brandon and Brody Jenner are Bruce's sons from his second marriage to Linda Thompson. He and Kris Jenner, of course, had Kylie and Kendall Jenner.
Bruce's stepdaughter Kourtney Kardashian also has three children with Scott Disick, and Kim Kardashian is the mother of Kanye West's baby North.
This one has to be particularly special for the Jenner side, though. Congratulations to Brandon and Leah and the entire family on the exciting news!
Jill Duggar and Derick Dillard are expecting their first child in March 2015. She'll be the second of the 19 Kids and Counting brood to have kids of her own!
Alec Baldwin and wife Hilaria are expecting their second child together, as seen here. Alec also has an older daughter, Ireland, from his marriage to Kim Basinger.
Chad Michael Murray and Sarah Roemer are married, having tied the knot in secret! They're also expecting their first child! Talk about a two-for-one surprise!
