Hollywood star turned politician Arnold Schwarzenegger is visiting David Cameron in Downing Street later.
The governor for California has struck up a friendship with the prime minister over a shared interest in green issues.
Mr Cameron visited Mr Schwarzenegger in his home state in 2007.
The two men will visit Wellington Barracks near Buckingham Palace to see the 1st Battalion the Grenadier Guards and Mr Schwarzenegger will watch the changing of the guard.
Mr Cameron’s spokesman said: “He’s coming to the end of his term, he’s in London and he’s visiting the prime minister.”
The former Terminator actor was reportedly among the first to congratulate Mr Cameron when the general election results began coming in on 6 May, with what turned out to be a somewhat premature phone call shortly after polls closed at 2200BST.
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