Emma Roberts isn't just making a name for herself as a rising star in Hollywood — she has four films in the works — she's also leaving her mark in the world of fashion.

The 21-year-old routinely gets name-checked in magazines for her style on the red carpet and off, and she's a coveted front-row guest at fashion shows.

It seems fitting then that she would sign on to be an official fashion adviser for Snapette, a social media shopping app, where she'll blog and share photos of her fashion finds.

Roberts talks about her love of sunglasses, style inspirations and her one fashion rule:

AP: How did you become interested in fashion?

Roberts: Fashion has always been something I've had an interest in. Ever since I was little, my mom would tell me I would try to go to school in my dress-up heels and ... a feather boa, and not see anything wrong with it. For me, fashion has always been something I love and something I get more into as I get older wanting to kind of take more risks, design stuff and be more involved in it in any way.

AP: Are you cautious not to wear too-casual clothes, like sweatpants, outside because you could be photographed?

Roberts: I never wear sweatpants out of the house. That's probably my only rule. I know I'll regret it if someone takes a picture of me. I'll be like, 'Ugh. I'm that girl that was wearing sweatpants and flip-flops out and about all day,' and I don't want to be that person. And I even have friends that are like, 'Did you see that photo of me?' I'm like, 'Why are you wearing pajamas outside?' So that's like my only rule, really. No pajamas outside (laughs). By the way, I want to wear sweatpants on an airplane every day of my life but I'm like, 'I don't want a picture of me.'

AP: Is there any accessory you love to buy?

Roberts: I've always been a fan of sunglasses forever. I'm the kind of person who wears a new pair every day. I had a go-to pair that were these Dior, black cat-eye ones. Literally I've lost them three times, I have to re-buy them and I just found out I lost them the other day and I'm like devastated. There is a collaboration that Nanette Lepore designed a pair with me as her muse for Sunglass Hut and they ended up being these white cat-eye sunglasses, and I'm like, 'Oh my God. So lucky!' But they're limited-edition so even I have to be careful not to lose them because I'm like, 'I'm not going to be able to get them again even though they're the Emma sunglasses.' I ended up with two pairs and my sister already stole one. ... The other pair I'm scared to take out because I know they're going to end up in a cab somewhere in New York City and they'll have been mine.

AP: Who are your fashion inspirations?

Roberts: I'm a big fan of people that look good on the carpet and off the carpet. I love Kate Bosworth, she always looks put together. I love Sienna Miller. ... Audrey Hepburn, I think she looked immaculate. I still want everything she wore forever ago today.

AP: What about nail polish? What color do you like to wear?

Roberts: I'm a red nail person or nothing. I always see people with these great designs but after 10 minutes of sitting there I'm like, 'Dry!' It's the worst sitting there waiting. When people have cute things on their nails I'm like, 'How long did that take? How long did you sit there? And you can't do anything because your nails are wet!'

AP: Why did you partner with Snapette?

Roberts: Snapette is a new app for the iPhone and it was something I wanted to get involved in because I am a huge fan of fashion and of course I love shopping, and this is something like Instagram-meets-Yelp where you can take photos, you can 'like' photos, you can look at what other people are uploading and find out where to buy everything, so for me I'm always like, 'Where'd you get that? Where'd you get that?' So, for me, this app is great because you can look at what you want and see where the closest place is to go and buy it so it's awesome.