Christina Aguilera and fiancé Matthew Rutler hold hands while wearing matching black outfits for a night out during Paris Fashion Week

Christina Aguilera and her fiancé Matthew Rutler looked loved up as they stepped out in matching black outfits for an evening in Paris during Fashion Week on Thursday.

The Genie in a Bottle singer, 45, and Matthew, 40, enjoyed a night out at the lavish Peruvian restaurant Manko in the heart of the City of Love. 

For the occasion, Christina looked effortlessly stylish while keeping warm in a long, velvet black coat paired with sunglasses.

Meanwhile, Matthew opted for a leather longline jacket over a matching co-ord. 

The pair appeared in high spirits as they made their way to the restaurant after her performance at the Gala des Pièces Jaunes.

While the pair have been engaged now for over a decade, Christina previously said that they were in no rush to get married.

The Dirty singer told PEOPLE in 2015: 'Having just moved into a beautiful new home we call "the Sanctuary", having a baby, and now being so excited to get back to work, I have my hands full, and am not in a rush to set a date.

'I want to plan it and cherish the moment, while not feeling rushed.'

The happy couple met in 2010 on the set of Burlesque, where Matthew was working as a production assistant.

The singer said: 'Matthew is a special person. We had a really strong friendship on the movie.

'He’s the kind of person you could spend hours on the phone talking to and all of a sudden it’s daylight.'

Christina was previously married to actor Jordan Bratman between 2005 and 2011.

The former couple had one child, Max Liron, now 17, who they have chosen to keep largely out of the spotlight.

It comes as Christina celebrated her 45th birthday in style last month. 

The Dirrty singer dropped a carousel of images marking her special day - including several which showcased her fabulous look where she showed off her 50lbs weight loss.

The birthday girl opted for a curve-hugging white dress that clung to her slender figure, fishnet stockings, glittering ruby red heels, and a polka dot beanie atop her cascading blonde hair.

'feeling the birthday love,' she captioned the post.

Aguilera enjoyed a holiday-themed bash that included a candy cane birthday cake, dinner beneath magical white lights, and of course plenty of Christmas decorations. 

Guests dined outside at a balloon-adorned table and lavished the birthday girl with gifts inside. 

The star first sparked Ozempic rumors back in May last year as she showed off her weight loss.

'So Christina Aguilera found an Ozempic pen and now she just needs to find a pen to give us a classic hit,' another also penned.

However, others came to her defense, with one writing, 'All this talk about Christina Aguilera and her body is really gross. Christina has always been thin, she was naturally thin as a teenager.'

'Her body fluctuated throughout the years as it does when [one gets] older, live[s] and [has] kids. Ozempic or not. She looks amazing. Leave her alone, f***.' 

Following the speculation, she has since commented on the 'media's obsession' with her weight over the years during an interview with Glamour in August.

'When you're a teenager, you have a very different body than when you're in your 20s,' she informed the outlet.

'I started to fill out, and then that was unacceptable because it was like, "Oh, she's getting thicker." Then I had industry people: "They liked your body and how you were as a skinny teenager."'

However, as she has grown older, Christina revealed that she does not let comments about her weight affect her.

'I have a maturity now where I just don't give a f*** about your opinion. I'm not going to take it on.'

The mother-of-two added, 'It must be your responsibility to take up your space. Other people's opinions of me are not my business.'