Fresh from a sun soaked holiday to Mustique, Kate Middleton, 31, looked as elegant as always as she arrived at the central London venue on Tuesday evening (11 February).
Kate chose a full-skirted Jenny Packham gown cinched at her trim waist with a belt. Look familiar? That's because she first wore the gorgeous dress to the 100 Women In Hedge Funds Dinner in London last year.
The royal was without husband Prince William at tonight's glitzy event, the Portrait Gala 2014: Collecting To Inspire fundraiser, which raises money to support the Gallery's daily work in delivering its exhibitions and displays, and helps the Gallery's Portrait Fund, which allows it to acquire portraits of outstanding national importance.
Several well known personalities either drew or 'wrote' portraits for the event to raise money, while guests also enjoyed a live auction and a raffle.
For The Duchess, it was her first royal public engagement of 2014 and came a few days after she returned from a New Year's break to the Caribbean island of Mustique.
Kate was seen arriving on the sun-drenched island with her baby son Prince George, where they met up with her family to enjoy the annual Middleton holiday. Prince William remained in the UK as he's currently studying an agricultural course at Cambridge University.
The royal couple became first-time parents in July 2013 when Kate gave birth to George, the third-in-line to the throne, at St Mary's Hospital in Paddington, London.
Mustique marked baby George's first foreign holiday.
It's been suggested he will embark on his second foreign adventure later this year by accompanying Kate and William on an official trip to Australia.
Meanwhile, Kate, who studied Art History at St Andrew's, has been a supporter of the National Gallery for some time. Her last public visit to the venue came in April 2013 when the then-pregnant Duchess attended an Art Room event.
She is a patron of the Art Room, a charity for five to 16 year olds who are experiencing emotional and behavioural difficulties. The charity - which has five bases in Oxford and London - uses art therapy to help increase kids' self-esteem, self-confidence and independence.
An official portrait of Kate - her first - was unveiled at the National Portrait Gallery in January 2013. Both Kate and William attended the unveiling of the work by artist Paul Emsley.
First photos of Prince George after his birth: