Alexa Chung looked stunning in a baby blue maxi dress as she stepped out for a dinner with her rumoured fiancé Tom Sturridge in London on Thursday night.

The model, 39, showcased her slender figure in the strapless garment that she paired with black tights.

She donned black ballet flats, and looked loved-up as she was captured heading to the car carrying a bouquet of flowers in her hands.

Alexa looked radiant as she flashed a huge smile to the camera, and barely wore any makeup except for a cherry lip gloss.

Meanwhile Tom, 37, made a fashion statement in a silk graphic print shirt, and a pinstripe black blazer.

The Sandman star wore matching trousers, as he was spotted getting on the cab with Alexa following their romantic outing.

The lovebirds' appearance comes after they crossed paths again with Pregnant Sienna Miller at the star-studded Vogue World bash earlier last week.

Alexa and the actor - who have sparked engagement rumours for months - looked as loved-up as they departed the afterparty at George Mayfair.

Sienna, 41, who is expecting her second child with boyfriend Oli Green, 26, dated Tom for four years between 2011 and 2015 and share a daughter Marlow, 10.

But the former couple appears to always be very friendly when bumping into each other in public. 

Back in June Alexa, was spotted with a ring on her wedding finger, leading people to speculate that they are engaged.

The son of award-winning film director Charles Sturridge, Tom seems open to marriage, while Alexa for her part, previously mused: 'I just don't get why marriage is different from non-marriage — I just don't get it.'

Her spokesperson declined to comment when asked about the rumours.

Tom and Alexa went public with their romance last July when they attended day seven of the Wimbledon Championships.

In a nod to their very unique set-up, in their first public outing, they were joined by Sienna, who looked joyous while sitting in front of the couple.

Tom and Sienna previously dated for four years and split in 2015. They are still on good terms, with Sienna calling Tom her 'best friend'.

Sienna has given her seal of approval for her ex and Alexa and in December told Vogue UK: 'I'm really happy for them. It's genuinely lovely.'

The Layer Cake actress even joked about their co-parenting situation and revealed that their daughter Marlowe has brought one of Alexa's jumpers home, which she has since claimed for herself. Sienna quipped: 'I've got one upstairs!'

Following their split in 2015, it was claimed Sienna and Tom had different goals.

A source said: 'Tom wanted to get married and have more children. Sienna didn't.

'This year everything exploded with Tom in London and Sienna leading a separate life in the US and [her appearance at] Cannes'.