Caitlyn Jenner has admitted she and Sophia Hutchins are "very close".
The 68-year-old reality star - who was previously known as Bruce Jenner and has six children from her three marriages - has been romantically linked with the 22-year-old transgender model since last September and though she wouldn't confirm their relationship, she did reveal they are "inseparable".
She told Variety: "We are not going to get into that. But we are very close.
"We do a lot of things together. We're kind of inseparable. We're the best of friends."
The 'I Am Cait' star - who transitioned when she was 65 - also revealed she now quietly works as a transgender rights advocate to congress.
She said: "Today, I'm very politically involved. Nobody really knows it. I do it very quietly because I have been so criticised by the liberal side of the media. I can get more things done if I don't stick my nose into everything publicly."
The former 'Keeping Up With the Kardashians' star still gets recognised a lot in public and always tries to make the time to stop and take photos with fans because she wants to leave them with a good impression of someone from the trans community.
She said: "If I'm out, I take a minimum of 30 selfies with people. It drives everyone around me crazy.
"That may be the first time they've met anybody who's trans.
"I want that to be a pleasurable experience. I want to be nice to people. I want to have a smile on my face.
"And they walk away and say, 'Oh, my God! Caitlyn was so nice.' That's the way I want them to think of trans people. That we're nice."