Hillary Clinton and Huma Abedin have marked a relationship milestone, according to the Washington Post: they’ve been together for 20 years.

“Few people know this, but Huma Abedin and Hillary Clinton celebrated their professional anniversary in September: it’s been 20 years since the two first started working side-by-side,” the paper reports.

They have a remarkably personal and close relationship.

Among Hillary Clinton’s released emails was one between the two, with Abedin writing, “Checked on you but you were sleeping.”

Clinton later responded, “I’m up now so come when you are able. Just knock on the door to the bedroom if it’s closed.”

The pair appeared at the New York City Pride Parade earlier this year.

Bill Clinton was nowhere to be found.

The Post notes Abedin’s almost fan-like admiration for Clinton.

During an interview with the “Call Your Girlfriend” podcast, Abedin recalled first seeing her boss:

You know these things that happen in your life that just stick? That she walked by and she shook my hand and our eyes connected and I just remember having this moment where I thought, ‘Wow, this is amazing.’ … She would probably be so annoyed that I say this, but I remember thinking, ‘Oh my god, she’s so beautiful and she’s so little!’

If the pair make it to the White House, Abedin says she would prefer to stay in the shadows.

“I prefer to be behind-the-scenes and stay behind-the-scenes,” she told the podcast.

“It does take a village to support Hillary Clinton. I am part of that village … I help keep the trains moving on time.”