Nassar popped the question over the weekend, and both shared photographs of the moment to their Instagram pages on Wednesday.
“SHE SAID YES!!” Nassar wrote in his post. “I’m feeling like the luckiest (and happiest) man in the world right about now. Jenn, you are everything I could have possibly imagined..and so much more… Here’s to forever!”
Gates, 23, responded to the Nasser’s missive and also wrote a message of her own, calling the showjumper “one of a kind.”
Her mother, Melinda Gates, wrote in a message on her own Instagram page that she was “so thrilled.”
The med student and fellow equestrian has shared photographs and stories about their relationship before, including one Thanksgiving Day post in which she described how she was “incredibly grateful for this man” and the other loved ones in her life.
Jennifer is the oldest of Bill and Melinda Gates’ three children. The second-wealthiest person in the world – behind Amazon founder Jeff Bezos – Bill Gates co-founded Microsoft in 1975 with Paul Allen.
The largely philanthropic pair founded the Bill & Melinda Gates Foundation in 1997. The foundation strives to "reduce inequity across the globe," according to the annual report, and is the "largest charitable foundation in the world," Investopedia reported.