Matt Smith supports girlfriend Lily James on her big night at Mamma Mia! Here We Go Again premiere in London

They have been dating since 2014.

And Matt Smith and Lily James looked happier than ever as they arrived hand-in-hand at the premiere of Mamma Mia! Here We Go Again in London on Monday night.

The stunning blonde actress, 29, looked every inch the leading lady in a strapless ivory gown as she headed to the Eventim Apollo.    

The happy couple: Matt Smith, 35, and Lily James, 29, looked happier than ever as they arrived hand-in-hand at the premiere of Mamma Mia! Here We Go Again in London on Monday night 

The happy couple: Matt Smith, 35, and Lily James, 29, looked happier than ever as they arrived hand-in-hand at the premiere of Mamma Mia! Here We Go Again in London on Monday night 

Lily stunned in the voluminous dress which featured a delicate Parisian print on the full-bodied skirt, while the ribboned bodice highlighted her slender frame.

Featuring a dipped hemline, the actress, who plays a young, carefree version of Donna in the musical, showcased her toned legs and added boost to her 5ft 5ins frame with a pair of silk Louboutin bridal-inspired stilettos.

Lily complemented her glamorous dress by styling her hair in an elegant half-up do and finished off the look with a soft grey smoky eye and a slick of pink lipstick.

Her handsome boyfriend Matt Smith, 35, looked dapper in a taupe double breasted suit with dark buttons.

Dazzling: The stunning blonde actress looked every inch the leading lady in a strapless ivory gown as she headed to the Eventim Apollo

Dazzling: The stunning blonde actress looked every inch the leading lady in a strapless ivory gown as she headed to the Eventim Apollo

Showing his support: The actress was joined by her handsome boyfriend Matt Smith, 35, who looked dapper in a stone grey suit

Showing his support: The actress was joined by her handsome boyfriend Matt Smith, 35, who looked dapper in a stone grey suit

Brimming with joy: Lily beamed as she left her hotel and headed to the premiere of the hotly-anticipated sequel

Brimming with joy: Lily beamed as she left her hotel and headed to the premiere of the hotly-anticipated sequel

Rule the red carpet like Lily in Christian Louboutin wrap heels

Lily James never fails to impress when it comes to style. Taking to the London premiere of Mamma Mia 2, the actress took the opportunity to up her style game even further (who knew it was even possible!)

Styled by Rebecca Corbin-Murray, Lily stunned in a bandeau ball gown and her now-iconic natural make-up look.

Unfortunately, while you can't shop that fairytale gown, you can inject some Lily into your life via those standout pumps!

Of course, the heels in question are Christian Louboutin; we couldn't miss that iconic red sole anywhere! Finished with a dreamy satin ankle bow, these heels are the epitome of elegance.

Click right to bag the heels for yourself at Neiman Marcus. Or, try our edit below for a roundup of our favorite lookalikes. With almost all of our options at a significantly lower price than the star's, you can steal the look on any budget!

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He opted for a powder blue shirt, dark blue tie and matching pocket square which left him oozing old-school British style.

The former Doctor Who star slipped into a pair of brown loafers, with his coordinated socks on display. 

Matt completed his stylish ensemble with signet rings on his pinkie fingers, and by shielding his eyes with a pair of light-brown rimmed shades. 

Stunning: Lily complemented her glamorous dress by styling her hair in an elegant half-up do and finished off the look with a soft grey smoky eye and a slick of pink lipstick

Stunning: Lily complemented her glamorous dress by styling her hair in an elegant half-up do and finished off the look with a soft grey smoky eye and a slick of pink lipstick

Breathtaking beauty: Lily stunned in the voluminous dress which featured a delicate Parisian print on the full-bodied skirt, while the ribboned bodice highlighted her slender frame
Breathtaking beauty: Lily stunned in the voluminous dress which featured a delicate Parisian print on the full-bodied skirt, while the ribboned bodice highlighted her slender frame

Breathtaking beauty: Lily stunned in the voluminous dress which featured a delicate Parisian print on the full-bodied skirt, while the ribboned bodice highlighted her slender frame

Bridal-inspired: Lily opted for a pair of silky white Louboutin ribbon heels to complement the dress 

Bridal-inspired: Lily opted for a pair of silky white Louboutin ribbon heels to complement the dress 

The actor beamed with pride as Lily led him by the hand, and Matt graciously stepped aside while fans and photographers focused their attention on his beautiful girlfriend and her co-stars.

Matt and Lily's blue carpet appearance, comes after the actress recently spoke about the strength of her romance with the hunky actor - admitting that she has found it difficult to find the perfect work/life balance and will consider slowing down in the future to focus on their relationship.

Lily spent months away from her man Matt last year, when she filmed Mamma Mia! in Croatia.

Happy lady: Lily couldn't contain her elation while at the premiere of her latest film

Happy lady: Lily couldn't contain her elation while at the premiere of her latest film

Handsome: The Crown star Matt took a back seat for the premiere as he showed his support to girlfriend Lily, but looked sharp in a stone grey suit and suede brown loafers
Smart: The actor coordinated his double-breasted jacket with a black tie and matching handkerchief

Handsome: The Crown star Matt took a back seat for the premiere as he showed his support to girlfriend Lily, but looked sharp in a stone grey suit and suede brown loafers 

Boyfriend goals: Matt beamed with pride as Lily led him by the hand, and graciously stepped aside while fans focused their attention on his beautiful girlfriend and her co-stars

Boyfriend goals: Matt beamed with pride as Lily led him by the hand, and graciously stepped aside while fans focused their attention on his beautiful girlfriend and her co-stars

Clearly she wasn't too happy about it, she said in an interview with Marie Claire: ‘I’d like a few months where I go travelling and just switch off. When you’re an actor, its like, "you’ve got to keep the momentum up.” And I’m like, “No!” 

'You have to trust that things won’t go away if you stop for a bit. I haven’t really stopped, and I don’t think that’s a feasible way to work. For me, eventually, that’s not the lifestyle I want.

She revealed that her views affected everyone in her personal life: 'That’s not only with regards to my relationship with Matt, but with my friends and family. There’s so much you miss. That’s why I know I can’t keep working at this intensity. I finish a job; Matt starts one.’ 

Priorities: Matt and Lily's blue carpet appearance, comes after the actress recently spoke about the strength of her romance with the hunky actor - admitting that she will consider slowing down in the future to focus on their relationship

Priorities: Matt and Lily's blue carpet appearance, comes after the actress recently spoke about the strength of her romance with the hunky actor - admitting that she will consider slowing down in the future to focus on their relationship

Simply stunning: In keeping with the blue and white theme of the movie, Lily modelled the full volume of the skirt as she took to the red carpet
Elegant: Lily looked like a princess in the beautiful strapless dress

Simply stunning: Lily stunned in the voluminous dress which featured a delicate Parisian print on the full-bodied skirt, while the ribboned bodice highlighted her slender frame

Show-stopping: The cast dressed to the nines as they showed off their array of glamorous ensembles in a group photo

Show-stopping: The cast dressed to the nines as they showed off their array of glamorous ensembles in a group photo

It has been ten years since the film Mamma Mia! burst on to cinema screens.

And a decade later, a host of stars turned out to celebrate the premiere of the much-anticipated sequel Mamma Mia! Here We Go Again in London on Monday night.   

The newest film follows Sophie (Amanda Seyfried) as she tries to run her mother Donna's (Meryl Streep) villa in Greece whilst pregnant, as she finds out more about her past.

The three Mamma Mia generations: Lily and Amanda beamed as they reunited with music legend Cher, who will play Donna's mother in the musical 

The three Mamma Mia generations: Lily and Amanda beamed as they reunited with music legend Cher, who will play Donna's mother in the musical 

Gorgeous: The leading ladies beamed with delight as they posed up a storm for photographers on the blue carpet

Gorgeous: The leading ladies beamed with delight as they posed up a storm for photographers on the blue carpet

In the film, Lily plays young Donna during her infamous time with her three love interests Sam (Jeremy Irvine), Harry (Hugh Skinner), and Bill (Josh Dylan).

Mamma Mia! Here We Go Again 'goes back and forth in time to show how relationships forged in the past resonate in the present,' according to Deadline.

The original movie was set on a Greek island where young bride-to-be Sophie discovers that any one of three men - Bill (Stellan Skarsgard), Sam (Pierce Brosnan) or Harry (Colin Firth) could be her father.

Amazing looks: The Doctor Who star showcased his enviable muscles in his form-fitting powder blue shirt
How to accessorise: He added a navy tie to his look

Amazing looks: The Doctor Who star showcased his enviable muscles in his form-fitting powder blue shirt 

Suave: Matt accessorised his look with tan sunglasses which shielded his eyes from the sun

Suave: Matt accessorised his look with tan sunglasses which shielded his eyes from the sun

Hunky: Matt looked incredibly dapper in his stone-coloured suit 

Hunky: Matt looked incredibly dapper in his stone-coloured suit 

It's party time! The actor climbed out of the taxi as he headed into the party with a whole host of stars

It's party time! The actor climbed out of the taxi as he headed into the party with a whole host of stars

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Matt Smith supports Lily James at Mamma Mia! film premiere in London

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