The pair were spotted in a dingy stairwell at the Brompton Club in the early hours of this morning.
The unidentified blonde huddled close to the Prince as she puffed on a cigarette before joining him back inside.
The rendezvous comes in the same week the Prince complained that he wished he were "normal", and suggested his royal duties are be off-putting to women.
The Prince gave an interview to CBS News at the end of his 10-day tour to the Caribbean and Brazil to celebrate the Queen's Diamond Jubilee.
Asked if royalty lived up to the fairytale, he told the US broadcaster: "No, not at all. As any girl would ever tell you.
"It's sort of, 'Oh my God, he's a prince'. But no. The job that it entails - I mean look at me, I'm 27 years old, and not so much searching for someone to fulfil the role, but obviously, you know, finding someone that would be willing to take it on."
Despite his sob story, the Prince succeeded in catching the eye of Miss Bahamas during his Caribbean tour.
Anastagia Pierre, who recently competed in the Miss Universe competition, declared: “I came here to fall in love with Prince Harry. He's hot. He is single now, so would I marry him? Yes.”
During his interview he also spoke of the responsibility that comes with his royal status.
He admitted his title can make a "huge difference" to a country or charity, but added: "There's a lot of times that both myself and my brother wish, obviously, that we were just completely normal.
"We've been born into this position and therefore we'll do what we need to do to people and to kids that need it.
"It really is that simple for us."
Asked how he might privately mark his grandmother's milestone this year, he said: "When I get back, I'm sure ideas will start flowing.
"Us, as a group of grandchildren, will hopefully be able to have a dinner and do something fun with her, maybe take her out on the town, I don't know."
Earlier this week, Prince Harry announced ambitious plans to expand the work of his Sentebale charity from helping disadvantaged children in a single African country to carrying out projects worldwide.
The royal said once his organisation was ready for the challenge he wanted to take its concept to other nations.
The charity works supporting established groups, charities and bodies in the southern African country of Lesotho with funds or managerial help.
Do you know who the mystery blonde is? Email us at huffpostuk@teamaol.com
Scroll down for a picture of Miss Bahamas
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Hot stuff: Miss Bahamas, Anastagia Pierre. Scroll down for pictures of Prince Harry in Belize
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Britain's Prince Harry, left, meets enthusiastic local people during a walkabout at a "block party" in the newly named Queen Elizabeth II Boulevard, in the capital Belmopan, Belize, central America, Friday March 2, 2012. The Prince is visiting Belize as part of a Diamond Jubilee tour where he will be visiting Belize, the Bahamas, Jamaica and Brazil as a representative of Queen Elizabeth II, to celebrate her jubilee. (AP Photo/Chris Jackson, PA)
Britain's Prince Harry, left, meets enthusiastic local people during a walkabout at a "block party" in the newly named Queen Elizabeth II Boulevard, in the capital Belmopan, Belize, central America, Friday March 2, 2012. The Prince is visiting Belize as part of a Diamond Jubilee tour where he will be visiting Belize, the Bahamas, Jamaica and Brazil as a representative of Queen Elizabeth II, to celebrate her jubilee. (AP Photo/Chris Jackson, PA)
Britain's Prince Harry, left, meets enthusiastic local people during a walkabout at a "block party" in the newly named Queen Elizabeth II Boulevard, in the capital Belmopan, Belize, central America, Friday March 2, 2012. The Prince is visiting Belize as part of a Diamond Jubilee tour where he will be visiting Belize, the Bahamas, Jamaica and Brazil as a representative of Queen Elizabeth II, to celebrate her jubilee. (AP Photo/Chris Jackson, PA)
Just day after bemoaning the fact he couldn't find love, Prince Harry has been spotted chatting to a blonde on the steps of a private members nightclub.
The pair were spotted in a dingy stairwell ...
Just day after bemoaning the fact he couldn't find love, Prince Harry has been spotted chatting to a blonde on the steps of a private members nightclub.
The pair were spotted in a dingy stairwell ...
For God's sake! I've been "seen with a blonde" myself - every time I happened to be within a few feet of a random blonde and there happened to be someone there to see me! So this young man happens to not live his live avoiding blondes? Shock! Horror!
toakreon: For God's sake! I've been "seen with a blonde" myself
The paparazzi stop at nothing to get what they think is an interesting shot. Leave the guy alone Huff or next we will be seeing photos of him sitting on a 'throne'
barbabe: The paparazzi stop at nothing to get what they think
Wonder was she wearing knickers? If not what a view Harry had while she was sitting on the stairs. She wasn't wearing a skirt/frock, she was just wearing a broad belt.
arisole: Wonder was she wearing knickers? If not what a view
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Huffington Post UK | By Sara C Nelson Posted: 16/03/2012 09:58 Updated: 16/03/2012 10:58