He says he surprised the superstar singer for his birthday and they went for lunch.
A range of events is being held to mark the occasion at the arts complex beside the Thames.
However, the government's position is now unclear, saying it "no longer has a preferred option" for what to do next.
The portrait shows Sir Elton with husband David Furnish and their teenage sons Zachary and Elijah.
Paul Dacre told the High Court he put the "shutters down" on unlawful newsgathering techniques.
The musician says his privacy was breached in relation to health issues and the birth of his son.
The couple are among seven people suing the publisher of The Daily Mail and The Mail on Sunday for breaches of privacy.
Sir Elton tells Dean "I'm proud of you" as she cooks sausages and beans on a camping stove in Pembrokeshire.
The shirt celebrates the club's long-term relationship with the music icon.
