Catherine, Duchess Of Cambridge's sister Pippa Middleton has denied reports she is planning to walk down the aisle.

The party planner, who first hit headlines in April, 2011 when she stunned the world in an Alexander MCQueen dress at her sister's wedding to Prince William, insists she is not engaged to her stockbroker boyfriend Nico Jackson, according to a report on UsMagazine.com.

The pair has been dating for six months and reportedly visited her nephew, Prince George, shortly after his birth in July (13).