Diane Keaton on Her 'Addiction' to Collecting and Her New Book 'Saved: My Picture World'

A lifelong collector of images, Diane Keaton shares some of her favorites — old film stills, her late brother's collages, even some photos she took herself — in her latest coffee table book, Saved: My Picture World.

In an interview featured in this week's issue of PEOPLE, the 78-year-old icon talks about the book (out now), her beloved golden retriever Reggie, and what's next for her.

PEOPLE: What inspired you to do this book?

Keaton: I do nothing but collect. Have you noticed? It's a little bit of an addiction. So I figured I'd put some things together.

Where do you keep your collections?

I have a little room. But I've got to get more room. I need a mansion. I have about 60 scrapbooks of pictures I've cut out of magazines: fashion, bedrooms, portraits…

Could you be a hoarder?

Let's not go into details!

Do your kids [Dexter, 27, and Duke, 21] like looking at what you've saved?

They have no interest.

So who will inherit the collections? Maybe a presidential library?

I've been thinking about it. I don't think I qualify for presidential. There are places that take in family things. But let's not make it happen too fast. I want to be alive.

Are you looking forward to being a grandma someday?

Oh God, yeah. I can't imagine what that will be like. It's not really something [my daughter Dexter, 27, and her husband] are discussing right now. I'm going to love the kid, probably.

For now you have your golden retriever Reggie.

She was a gift out of nowhere! I didn't say I wanted a dog, but a friend gave her to me. She's so pretty. Right now she's chewing up a box.

Does she sleep on your bed?

Oh yeah. It's the best.

Do you have acting projects coming up?

Well there's Book Club 2. I'm looking forward to it. Those women are fantastic.

Do you think you'll ever retire?

I don't want to! At all.

For more about Keaton, pick up this week's issue of PEOPLE, on newsstands Friday.