Kate Middleton shows off pregnancy glow in Whistles dress at National Portrait Gallery

Kate Middleton looked radiant in a red dress from the high street store as she visited the gallery in London this morning

Kate Middleton showed off her pregnancy glow as she visited the National Portrait Gallery with Prince William this morning.

The radiant Duchess of Cambridge arrived at the historic London landmark to watch her first official portrait, a work by award-winning artist Paul Emsley, be unveiled.

KATE MIDDLETON CELEBRATES BIRTHDAY WITH TRIP TO CIRQUE DU SOLEIL

The soft focus head and shoulders portrait, commissioned by the National Portrait Gallery, reportedly follows Kate's suggestion to depict her natural, not official, persona.

The Duchess chose a flowing burgundy dress from high street store Whistles for the occasion, which skimmed over her curves and showed no sign of a baby bump.

After spending 10 minutes viewing the painting, William and Kate then privately met the artist, his wife Susanne and daughter Marie, describing the portrait as 'amazing'.

'It's just amazing, I thought it was brilliant.'

Prince William was equally as impressed with the portrait of his wife, telling the artist: 'It's beautiful, it's absolutely beautiful.'

After viewing the painting, Kate Middleton, who is patron a patron of the gallery, and Prince William, attended a private breakfast reception, also attended by Kate's parents, Michael and Carole Middleton, her sister Pippa and brother James.

Yesterday it was revealed the family have been in London this week, celebrating Kate Middleton's 31st birthday.

It's thought Prince William arranged a birthday treat for the group, including a box at the Royal Albert Hall to watch a performance of Cirque Du Soleil's acclaimed Kooza.

WATCH: Kate Middleton's most stylish moments

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