James Middleton, 26, and TV personality Donna Air, 33, have gone public with their fledgling romance.
Kate Middleton's younger brother was spotted leaving LouLou's private members' club hand-in-hand with the blonde, who looked coy as the cameras captured their moment together.
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The pair began their night out by seeing hit musical The Book of Mormon in London's West End.
They were later joined at LouLou's by Princess Beatrice, who is a friend of Donna's and has also come to know James since his sister's wedding to Prince William in 2011.
James has been a low-key member of the Middleton family since the royal wedding and has kept his private life closely guarded.
Now, it seems he is comfortable taking his relationship with Donna into the public arena.
"They have been dating for about three months," a source close to the couple said. "They enjoy each other's company and are getting to know each other.
"Donna thinks James is a kind and wonderful guy. He is a real gentleman and very generous and he is showing her a good time."
Donna has been on the dating scene since splitting from her fiancé, millionaire businessman Damian Aspinall, in 2007. The former couple are parents to Freya, who is nine.