Steven Tyler has reportedly moved in with his 28-year-old girlfriend.

The 67-year-old rocker is rumored to be making the push to share his Los Angeles and Nashville residences with Aimee Ann Preston, known as a personal assistant to several Hollywood luminaries.

An insider close with the couple, says Preston maintains a professional role inside Tyler's organization.

"I never see them holding hands or anything of that nature when I'm around them," says the source.

"She's always with him and always making sure his car is ready. They're never affectionate.

I was at an event with them and she was so on it."

The insider continues, "People are always wondering about them and now it's kind of finally out in the open.

I think at some point, because she is always with him and does live with him, it's like, 'OK, it's more than just a personal assistant.'

They're out together all of the time. She doesn't leave his side."