The former England footballer, who played twice for AC Milan, and his fashionista wife were surprise guests amongst a slew of celebrities at Highgrove, the King's private home.
Kyle, 34, is currently abroad playing for AC Milan, with reports claiming that his relationship with wife Annie, 33, is so strained they are 'barely talking'.
The right-back, who is on loan to the Italian team from Manchester City, was named in Sérgio Conceição's starting eleven for their 1-1 draw with arch rivals Inter at the San Siro on Sunday night.
The right-back, who is on loan to the Italian team from Manchester City , was named in Sérgio Conceição's starting eleven for the first time since completing his move to the Serie A giants.