Sienna Miller displays her slender frame in silk midi dress in London

She never fails to look glamorous, whether on and off the red carpet.

And Sienna Miller certainly did not disappoint in the style stakes on Tuesday night, as she stunned in yet another chic ensemble at the Rockins Park Chinois bash in London.

The actress and model, 35, slipped her enviably slender frame into a slinky black silk midi dress as she lead the glamour at the star-studded party, to celebrate the brand’s pop-up shop in Selfridges.

The Foxcatcher star certainly set pulses racing in her sexy black slip dress as she posed at the bash, supported by Ciroc.

Pulling into delicate spaghetti straps, the midi frock then plunged into a perilously low-cut V neckline to give an ample glimpse of her delicate cleavage underneath.

Remaining straight and classic in style, the black silk number skimmed her tall and slender frame all the way to its sophisticated calf-hem.

Keeping her look co-ordinated with barely-there black heels and a matching clutch bag, the blonde then jazzed up her toned down look with a colourful silk scarf, draped casually around her neck. 

Proving her natural beauty to all, the Alfie star swept her blonde tresses into a loose ponytail – leaving her radiant complexion, accentuated by sweepings of bronzer and blusher, on full display.

Tying the outfit together with emerald drop earrings and a delicate gold watch, Sienna was effortlessly glamorous as she posed up a storm at the event.  

The blonde proved to be a social butterfly at the event, as she posed with a number of her fellow guests – including Sienna Guillory, Tori Cook and Rockins co-founder Jess Morris. 

The beauty has been incredibly busy over the last few weeks, attending a number of fashionable events as well as the iconic Glastonbury festival last month.

It was at the famous music event that she was rumoured to have caught the eye of actor Brad Pitt – with sources claiming the pair were ‘very intimate’ and exploring the prospects of a summer romance. 

However, insiders went on to confirm she is still dating Foxcatcher director Bennett Miller, and rubbished the claims to MailOnline by stating: ‘Sienna’s finding it all very funny with friends have been texting her about Brienna laughing’. 

However, insiders went on to confirm she is still dating Foxcatcher director Bennett Miller, and rubbished the claims to MailOnline by stating: ‘Sienna’s finding it all very funny with friends have been texting her about Brienna laughing’.

Sienna joined a number of high-profile guests at the event – including typically quirky actress Sadie Frost. 

The 52-year-old star stood out from the crowds in a vibrant trouser suit, of bright blue leopard print.  

The outfit followed a pyjama style with a silk collared shirt and flared trousers, and left the top undone to reveal a thin black vest underneath – which gave a saucy flash of her bra and cleavage. 

Leaving her hair in its every day style and accessorising with dainty silver earrings, Sadie cut a casual but cool figure as she posed with her suited and booted beau Darren Strowger. 

The pair put on a united front at the bash, following recent rumours they had split after three years.

Back in May, the pair were seen enduring a tense and later emotional discussion at a cafe in Primrose Hill – but have attended multiple events together since.

Jamie Hince also attended the event with Lady Mary Charteris, alongside the likes of Karen Elson and Kara Rose Marshall.