The couple's relationship has been a contentious one over the years. Kushner is the brother of Jared Kushner, senior advisor to President Trump and Ivanka Trump's husband.
Kloss has previously spoken out about her political views, most recently endorsing Democratic presidential nominee Joe Biden in her voting Instagram post.
"What’s your voting plan?" Kloss captioned her post. "This was mine—signed, sealed, (notarised), and delivered ✅ #voteBLUE #scienceoverfiction"
She also spoke out about her and Kushner's views while appearing on an episode of Watch What Happens Live.
"I’m sure I’m not the only person in this country who does not necessarily agree with their family on politics," Kloss said. "I voted as a Democrat in 2016, and I plan to do the same in 2020."
She added, "My man and I have been through a lot together, and I'm so proud that he's my partner. It's not been easy, but it's worth it, and I would make that same decision a million times again."
Congratulations to the parents-to-be!