Kate Middleton's Dress Sells Out After Royal Baby Photo Release.

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That maternity dress Kate Middleton wore  in her latest photo with the royal baby and Prince William sold out within hours of the release of the family portrait.

The new mother was seen previously in fashion by British company Séraphine, shopping in the brand's "Renata" polka dot dress, which retails for $79, when she was still pregnant. Three weeks ago, the new mother was photographed arriving at her parents' home wearing Séraphine's blossom knot front lavender dress.

Cecile Reinaud, founder of Séraphine, said she was honored, once again, that the duchess chose her company's fuchsia knot front dress, which retails for $79, for the official family photograph.

As seen on ABC News