Duchess Kate wears lacy Seraphine dress for an Oslo lunch date

By Laura Sutcliffe

The Duchess of Cambridge was back in blue on thethird day the royal's action-packed tour of Sweden and Norway, spending some quality time with the King and Queen of Norway at a lunch engagement with her husband Prince William. 36-year-old Kate turned to one of her favourite maternity brands for the outing, dazzling in the the Marlene dress by Seraphine, which beautifully skimmed her baby bump and flattered her changing shape.

All of Kate's style moments from the royal tour

TAP TO VIEW IN GALLERYKate Middleton standing next to Prince William as they smile at the cameraDuchess Kate stunned in the lacy blue dress

William and Kate were guests of honour at the royal palace, having arrived in Norway slightly later than scheduled. After braving the snowy conditions, Kate was finally able to remove her powder blue, funnel necked coat by Catherine Walker to reveal her dress. The striking design boasts a contemporary high collar and had a definite retro feel to it, with many fashion bloggers drawing comparisons between Kate and Jackie O.

GALLERY: The best photos from the royal tour of Sweden and Norway

The expectant royal has showcased an enviable pregnancy wardrobe while on tour, favouring luxury designer Erdem. At the Fotografiska gallery on Wednesday evening, the mother of Prince George, four, and Princess Charlotte, two, looked striking in a textured light blue Erdem dress, which featured darker blue floras across the fabric. As a nod to her host country, she added a coat by Swedish designer Ida Sjostedt, and accessorised with a pair of oversized hoop earrings by British designer Robinson Pelham.

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