On Sunday morning she dressed herself with glittering diamonds, showing off her new necklace and massive sparkler from her fiancé Big Sean.

But even without sight of her shiny accessories, Naya Rivera proved to be just as classy whilst indulging in fast food - clearly taking a break from any pre-wedding diet.

Using her casual lunch as an opportunity to make a fashion statement, the 26-year-old Glee star covered her trim figure with a Chanel tracksuit to grab lunch at Chipotle Mexican Grill in Los Angeles.

The high-end ensemble was perfect for chowing down, complete with a sweatshirt and baggy trousers so as to feel comfortable while eating her sure-to-be filling meal.

Low maintenance, she also sported a pair of black high-top sneakers and went makeup free, covering her flawless skin with a pair of oversized shades.

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But Naya was still primped, with her locks in a voluminous style and carrying a chic bucket bag.

Excited for her cheap meal, the actress was seen smiling as she ordered her food from the restaurant.

Afterwards Naya left with a brown to-go bag that she grasped onto with her manicured paws.

Prior to her Chipotle run, Naya was dressed down in a black sweater, black sweatpants and Nike sneakers.

But the starlet didn't forget to add a little glam - the massive diamond engagement ring and matching necklace from her hip hop artist fiancé.

The Glee star was seen on a casual coffee run, strolling in a relaxed manner with 25-year-old Sean, as she eyed her cell phone.

She wore large black shades over her stunning brown eyes with her dark hair swept off her face with a headband.

The large square engagement ring was visible on her wedding finger, along with the string of diamonds around her neck.

The couple got engaged in October.

Big Sean surprised her yet again with another set of diamonds on Christmas day, as evidenced in a photo Naya posted to her Instagram and Twitter accounts featuring the jewels around her neck and the one on her ring finger.

She captioned it: 'Merry Christmas. photo and gift cred @bigsean'

The half Puerto Rican, quarter African American, and quarter German actress recently told People the secret to her successful relationship.

'At the end of the day, he knows "happy wife, happy life!" she said. 'So, he's kind of like, "Whatever you want, babe!"'

Big Sean is playing an active role in planning their big day.

'He's so involved,' she said. 'We definitely bounce things off of each other [and] we're always on the same page about everything, which is probably why we're getting married.'

The young fashionista has been getting a kick out of picking out her dress for the occasion.

'It's obviously something that I've never done before, but it's so fun,' she said. 'It's that Cinderella, Princess moment, and I went around with my friends, my mom, and it just felt amazing to try on all of those gowns.'

So far, they have not really discussed planning for a family.

'We'll see,' Naya said. 'Whatever happens will happen. Right now we're just so in love and really looking forward to spending the rest of our lives together.'

Naya is set to star as the voice of Sparkle in Christmas animated movie, The Naughty List, alongside actors Drake Bell and Matthew Lillard, and her latest single, Sorry, features her fiancé Big Sean.

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