The Obamas arrived for an informal dinner at Kensington Palace with the Duke and Duchess of Cambridge and Prince Harry tonight.
But Prince George was also allowed to stay up a few minutes past his bedtime to meet the guests.
Dressed in pyjamas and a dressing gown, George was pictured shaking hands with the President and playing on his rocking horse.
However, one person who was not in attendance was Princess Charlotte. Kensington Palace later confirmed she was fast asleep for the visit.
The rocking horse was a present from the Obamas to mark George`s birth, and they also gave him a stuffed toy when Charlotte was born last year.
The rocking horse has the Presidential seal on the saddle and looked to be a big hit with its two-year-old rider.
A Kensington Palace spokesman said: "Prince George stayed up to meet the president and first lady when they arrived at Kensington Palace.
"He was able to show the president and first lady a rocking horse - given to George when he was born - and a stuffed toy - given to George when Princess Charlotte was born - that had been previously given to him by president and Mrs Obama."
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