The images of the royal rookie looking elegant and poised at the Clarence House reception did her new in-laws proud.
However, the flowing half-up-half-down do that Kate chose revealed a peek of a scar underneath her hairline.
St James's Palace confirmed that the 3in-long mark is from a childhood operation, but her spokesman would not elaborate further.
John Scurr, a consultant surgeon, said it could have been caused by the removal of a birthmark.
