Cressida donned a black lacy shirt dress, which featured a daring thigh split that showed off her tanned and toned legs. She added height to her dancer's figure with black pointed stilettos and accessorised with gold rings.
The English Rose embraced her darker look with black eyeliner, a pop of cherry red lipstick and her hair perfectly styled into tousled waves.
She was joined on the front row by Anna Wintour, Suki Waterhouse and Alexa Chung. Cressida, who has modelled for Burberry and Mulberry campaigns, also mingled with Topshop founder Sir Philip Green and his 24-year-old daughter, Chloe.
Cressida was making her second appearance at London Fashion Week. On Friday night the actress, who attended the Topshop show with her sister, was on hand at a high-profile party organised by Vogue UK editor Alexandra Shulman, US Ambassador Matthew Barzun and his wife, Brooke.
Clinging on to the end of summer in a vibrant orange-hued silk mini-dress, Cressida sizzled at the exclusive bash. She joined the likes of Victoria Beckham, Lily Cole, Ellie Goulding and Poppy Delevingne.
Princess Eugenie’s close friend was the subject of reconciliation reports last week when she was among the select few invited to celebrate Prince Harry's 31st birthday at a pub in London.
Having taken part in an official engagement in Sussex on Wednesday, the handsome royal flew back to the capital by helicopter to spend the evening with his friends and former love at the Cross Keys pub in Chelsea.
Cressida is now a free agent, having split from her actor boyfriend Edward Holcroft and many royal fans are hoping that she will fall back into the arms of her former love Harry. The pair met through Princess Eugenie in 2012, but the fledgling actress reportedly felt unable to fully pursue her career while dating the Queen's grandson.