Britain's Prince Harry enjoyed a night out at the theatre.
The 29-year-old royal was spotted sitting on a bench in the front row of 'Fear and Loathing in Las Vegas', a production based on Hunter S. Thompson's novel, in London's Waterloo.
One theatre-goer posted on Twitter: "Delightful evening watching Fear and Loathing at #VaultFestival. Bit surprised to see Prince Harry right in front."
Another wrote: "Best celeb spot so far - Prince Harry at Fear & Loathing show #wildturkeyuk."
The play, adapted and directed by Lou Stein, is the headline event at the Vault Festival held in a site-specific underground venue.
The redhead was making the most of some much-needed downtime ahead of his next royal engagement.
He has been chosen to stand in for his grandmother at next Monday's (03.03.14) Westminster Abbey service honouring former South African President Nelson Mandela, who passed away aged 95 in December.
The special National Service of Thanksgiving will be broadcast by the BBC and will also include a speech by South African social rights activist and retired Anglican bishop, Desmond Tutu.

Britain's Duchess Catherine is expected to have a second child in 2015.
The public have been taking bets on when the 32-year-old royal - who gave birth to a son, Prince George, last July - will have a second baby, and the odds are high for next year.
There are currently 5/4 odds of another royal arrival next year from Betfred, with Paddy Power also making next year the favourite at 11/10.
Both bookmakers are still taking bets for this year, with odds of 13/8 given for a second bundle of joy, according to Entertainmentwise. However, this would mean the duchess would most likely already have to be pregnant.
Last year one bookmakers claimed to have taken almost £1.5 million in bets about the royal baby alone, with people taking guesses about everything from the third in line to the throne's sex, name and even eye colour.
The bets are also now on about Catherine and Prince William's next child, with odds looking good for a girl and Charlotte and Victoria topping the list for names.

John Challis felt guilty when he learned Roger Lloyd-Pack had passed away.
The 71-year-old actor starred alongside the comedy legend for over two decades in 'Only Fools and Horses', and although he tried to contact his close friend the day before he lost his battle with pancreatic cancer last month, he still feels guilty.
He said: "I was sitting at my computer and I saw it on the internet ... I just put my head in my hands, I couldn't believe it. It was a terrible shock.
"You get afflicted by a sort of guilt. I felt guilty, that I should have done more, I should have known more - not that you can change anything."
John - who played second-hand car dealer Boycie in the long running sitcom - also revealed that he was disappointed he wasn't able to say goodbye to his pal, who was known for his role as dopey road-sweeper Trigger.
He told the Daily Mirror newspaper: "I wanted to say goodbye. But I understand why he didn't want it out there. He didn't want anyone to know he was ill."
Although he's sad to be losing more friends as he gets older, John's glad he still has memories with Roger and their fellow stars Sir David Jason and Nicholas Lyndhurst to look back on when he's feeling down.
He added: "In times like this I do think of 'Only Fools' and it makes me smile again. Although there is always that worry because you look back and see yourself 30 years ago. You say, 'Where has all our hair gone? Where is all our energy?' "

EastEnders' Janine Butcher could get away with murder again.
The scheming character - who is currently awaiting trial over the murder of her husband Michael Moon (Steve John Shepherd) - is set to walk free, new on-set pictures suggest.
Charlie Brooks, who plays villainous Janine, was spotted filming scenes yesterday (26.02.14) which see Janine enjoying a glass of champagne before boarding a Eurostar train to Paris, France.
Janine previously dodged a prison sentence after pushing first husband Barry Evans (Shaun Williamson) off a cliff in 2004.
The murderous Walford character appears to have struck a deal with the returning Stacey Branning (Lacey Turner) and Kat Moon (Jessie Wallace) to avoid a second murder sentence, agreeing to drop charges against Stacey for stabbing her in exchange for Kat testifying that she saw Alice Branning (Jasmyn Banks) kill Michael.
Stacey fled the UK in 2010 after Janine assaulted herself and pinned the blame on the Walford favourite after discovering she killed Archie Mitchell (Larry Lamb).
A soap source told the Daily Star newspaper: "Janine could see it as the perfect opportunity to make some sort of deal. Her trial for killing husband Michael Moon is looming. And Stacey knows Janine is the only one who can help her.
"It's Janine who holds all the cards to Stacey's future. But with Janine languishing in prison there's no reason why she'd want to help Stacey unless there was something in it for her."
Both Janine and Alice are awaiting trial for the murder of Michael, who was stabbed by Alice - coming to Janine's defence - but it was Janine who finished the job.

Angela Rippon will front a new BBC game show.
The former newsreader and 'Take Me Out' presenter Paddy McGuiness will co-host 'Amazing Greys', which pits young people against "some of the UK's most talented pensioners".
A source told the Sun newspaper:"Each of the Amazing Greys [the pensioners] has an incredible talent they have spent a lifetime perfecting - be it physical, mental or something completely unique to them.
"The contestants will face a maximum of three Amazing Greys. If they can beat two of the three, they will leave with £10,000. If they don't they will leave with nothing."
The format is reminiscent of former BBC game show 'The Generation Game' - famously hosted by Bruce Forsyth in 1971 - which featured four different families pit old against the young in a bid to win prizes.
Angela says she looking forward to the new format and will be encouraging the elder generation throughout the competition.
She said: "The show will celebrate some of the most talented senior citizens and I will be there to cheer them on as they take on the younger contestants."
'Amazing Greys' will air on BBC One in the spring.

Vicky Pattison will star in new reality dating show 'Ex on the Beach'.
The 'Geordie Shore' favourite is among eight cast members who will heat up MTV this spring in the new series, which follows a group of singletons mingling on a sunset holiday.
However, the good times are soon rocked by the arrival of their former partners.
The cast - which includes four men and four women - will be on pins-and-needles as their ex-boyfriends and ex-girlfriends arrive on the beach one by one when they least expect it.
Vicky, who was previously engaged to former 'Geordie Shore' star Ricci Guarnaccio, is among the singletons that will come face-to-face with a blast from the past, but viewers will be left to wonder which of her exes will confront her on the beach.
The 25-year-old star said: "'Ex on the Beach' is so different to everything else that MTV and any other channel has out at the minute, I'm so excited for it. This show genuinely revolves around a group of young people going out and finding love, which I think is novel when so much emphasis is based on sleeping around and living for the moment. This is about finding someone and I do think that's really nice and I'm so excited to be a part of it."
'Ex on the Beach' will air on MTV this spring.

Justin Bieber is reportedly "smoking more weed than ever" since moving to Atlanta.
The 'Boyfriend' hitmaker is said to have sparked concern among his friends since moving out of Los Angeles - where he had a schedule set up by people connected to his business affairs - as he no longer has any real rules or plans, with insiders claiming he spends much of his time smoking marijuana or consuming sizzurp, a cocktail of Sprite, Jolly Tancher sweets and medications codeine and promethazine which is referred to by the singer and his pals as 'lean'.
A source told TMZ: "He is constantly high. Drinking more lean, smoking more weed than ever."
The insiders claim Justin doesn't really leave his house, but is spending a lot of time working on hip hop music in his recording studio - and is "rarely sober".
The 19-year-old singer - who has caused controversy with his recent antics, including being arrested for allegedly assaulting a limo driver, and also for driving under the influence (DUI), driving with a suspended license and resisting arrest - is said to be cutting down his inner circle, pushing away those who have "confronted" him about his drug use, and those who have "ratted him out" about his habits.

Shia LaBeouf's uncle has been ordered to repay $800,000 which he borrowed from the actor.
The 'Transformers' star won a lawsuit against Barry Saide, when Manhattan Supreme Court Justice judge Eileen Bransten ruled his relative must repay the money the Shia loaned him 2009.
According to the New York Daily News newspaper, the judge wrote in a decision signed Monday (24.02.14) but posted yesterday (26.02.14): "The terms of the note are clear and the amount due and owing ... is forth in the note."
The pair had an agreement which stated Barry should repay the loan in 15 instalments of $53,333 but he never did and he is now set to give as much as nine per cent interest.
Saide runs an employment agency and borrowed the money following the recession to help him get back on track.
When the lawsuit was filed last August, Barry expressed surprise about the 27-year-old actor's actions insisting he wouldn't have borrowed anything if he thought this would happen.
In an affidavit, he reportedly said: "Had I thought that Shayne and Shia would take this extraordinary step and seek to impoverish me, I never would have borrowed a dollar from Shia."
Barry also insisted he spent money looking after the Hollywood hunk and his mother Shayne before his rise to stardom.

Cindy Crawford accidentally got into bed with George Clooney.
The 48-year-old supermodel stars in a commercial for Casamigos tequila - a brand owned by the actor and her husband Rande Gerber - in which her spouse catches her between the sheets with the 'Monuments Men' star and she admits the funny advert was inspired by a real-life encounter.
Cindy recalled: "I woke up around midnight and snuck into the guest room and saw Rande laying facedown on the bed so I got on the bed and was like, 'Hey, babe, you gotta wake up', and 'babe' turned his head and it wasn't [Rande], it was George.
"I was shocked, and George, we were both so shocked, so we wandered downstairs, I went looking for Rande and was like 'George is in the guest bed, I just got in bed with him' and we all laughed."
The couple - who have children Kaya, 12, and Presley, 14, together - own a house in Mexico next door to George Clooney and the supermodel admits they were initially hesitant to purchase the property because of their actor friend's bachelor lifestyle.
She told 'Entertainment Tonight': "The two houses are practically adjoined, and I was like, 'Hmmmm we have kids, George is sometimes single, sometimes not single'. It could be great, or it could be a nightmare."
However, Rande thought it would be "fun".
He said: "I just thought it would be fun, we're always together anyway so why not have somewhere we could have all of us and our friends all be together."

Katy Perry helped deliver a baby yesterday (26.02.14).
The 'Roar' hitmaker was celebrating a "miracle" of a day which saw her assist with a home birth.
Katy tweeted: "Finally you can add "helps delivers babies in living rooms" to my resume! It's been a miracle of a day...❤️ Auntie Katy aka Stylist Auntie (sic)"
Though it is unclear who Katy was helping, fans have speculated she was by the side of her older sister Angela Hudson, who was revealed to be pregnant late last year.
The happy news would have been a welcome distraction for the 29-year-old pop star as it was reported yesterday she and John Mayer have split up after 18 months together.
It is claimed the couple decided to go their separate ways because Katy - who was previously married to Russell Brand - was so busy preparing for her upcoming world tour.
A source said: "She's stressed about the tour, they've been fighting. It is probably for the best, because she is going to be on tour for forever. Of course this happens all the time, I can't keep track anymore. But for now they are done."

Adam Driver has reportedly been cast as the villain in 'Star Wars: Episode VII'.
The 'Girls' actor is close to signing on the dotted line to star as a Darth Vader-inspired character in J.J. Abrams' upcoming intergalactic adventure, according to Variety.
While Disney and Lucasfilm declined to comment, the website reports that Driver - best known for playing oddball love interest Adam Sackler on HBO series 'Girls' - is pretty much confirmed for the role, with additional cast members expected to be unveiled next month.
Driver's 'Girls' co-star and director Lena Dunham appeared to support the rumour by posting on Twitter last night (26.02.14): "We're VERY proud of Adam Driver re: Star Wars. He's about to rip a hole in da force. Is that a thing? I guess I should see those movies? (sic)
However, she quickly backtracked her comment about the top secret casting, writing: "I confirm nothing bc I know nothing bc I'm on a plane with my dad! I just like Adam more than almost anyone, and JJ Abrams a whole lot too.(sic)"
Michael Fassbender and Hugo Weaving were initially linked to the part, but Driver is said to have emerged at the frontrunner in recent weeks when his previous scheduling conflicts were resolved.
The film is scheduled to shoot at London's Pinewood Studios in April, working from the script Abrams has re-written with Lawrence Kasdan.

Jason Statham will star alongside Melissa McCarthy in 'Susan Cooper'.
The 'Expendables 2' actor has been in talks with director Paul Feig since October last year and has finally agreed to join the project in which he will play a spy who teams up with McCarthy, sources have told Variety.com.
Feig also wrote the script and will produce with Peter Chernin and Jenno Topping, while Jessie Henderson is executive producing.
Hollywood tough guy Statham, 46, is known more for his action roles but he has featured in more comedic movies such as 'Lock, Stock and Two Smoking Barrels' and 'Snatch'.
However, he previously admitted he was drawn to the action genre since scenes are "a lot of fun" despite potential injuries, after he admitted he does his own stunts and often gets hurt.
He said: "I'm always getting banged about. I just expect it now - it's part of the job. Coalminers get dirty, I get hurt! It looks serious, but it's actually a lot of fun; although it can get pretty ridiculous at times."
Statham is set to hit the big screen in 2014's 'Heat' and 'The Expendables 3' while McCarthy has been cast in upcoming flicks 'Tammy' and 'St. Vincent de Van Nuys'.