She teamed it with glittery heels, believed to be Jimmy Choo's £525 Romy style and a jewel topped satin clutch bag. Of course, she sported her trademark bouncy waves and didn't forget her megawatt smile for the event, which was packed with inspirational speakers and hosted by the UK TV show Strictly Come Dancing's former contestant, Kate Silverton.
The mother-of-three attended the charity bash in her role as royal patron of 100 Women in Finance's Philanthropic Initiatives, having delivered a speech at the "Mental Health in Education" conference earlier in the day.
She was the guest of honour of The Royal Foundation's "Mental Health in Education" conference, which brings together delegates from across the mental health and education sectors to work together to tackle mental health issues in schools.
Revealing what she learned about William and Kate's parenting skills, Anne said: "They get down on the child's level and speak to them eye to eye to make their child feel empowered".
"It is clear that the positive development of our children is directly linked to those who care for them, teachers, carers and parents".