LONDON (AFP) - Prince Williams marriage to Kate Middleton was watched by billions around the world but second British royal wedding of the year will be much more down-to-earth. Queen Elizabeth IIs eldest grand-daughter Zara Phillips and her fiance Mike Tindall, the England rugby union veteran, are to marry in a private ceremony at Edinburghs Canongate Kirk on Saturday. The pair, both world-beating sports stars, has planned a wedding that combines their low-key style with just the right amount of regal splendour. All the senior royals are expected to attend William and Catherine included and the reception will be held at the nearby Palace of Holyroodhouse, the queens official residence in Scotland. Phillips, 30, the younger child of the queens only daughter Princess Anne, is a former world champion and 13th in line to the throne. Tindall, 32, played in Englands 2003 World Cup-winning team and captained the side in their victorious 2011 Six Nations campaign.