Zara Phillips and a big hug for her half sister Stephanie, 13

Zara Phillips and a big hug for her half sister Stephanie, 13

Zara and a big hug for her 13-year-old half sister

10:12 AM on 1st September 2011

Friendly: Zara yesterday with her half-sister Stephanie. Both will compete at the Burghley horse trials

Friendly: Zara with her half-sister Stephanie at the international horse trials at Burghley, Lincolnshire yesterday, both will compete at the 50th anniversary three day event

Hot to trot: Zara Phillips puts horse High Kingdom through his paces

Hot to trot: Zara Phillips trots up High Kingdom at Burghley Horse Trials in Stamford, Lincolnshire yesterday