A Night In With Audrey Hepburn. Lucy Holliday

a bark of delighted laughter.

      As we start down the half-billion stairs, I zip up my grey hooded top as far as it will go. This is partly to hide my own delighted smile – because I’m not sure I’ve ever made a boy laugh like that before – and partly because I don’t want anyone in the café to choke on their smoothie when a thirteen-year-old girl wanders in wearing an egg-yolk-yellow dirndl.

      

      Everyone on set is looking suspiciously gorgeous this morning.

      The catering bus is filling up quickly on our location shoot near King’s Cross this morning, with crew members already on their second (or third) bacon roll of the morning, and actors and actresses sipping, piously, at large mugs of tea and honey. All over the bus, people are looking as if they’re off for a Big Night Out. There are freshly blow-dried hairdos, newly fake-tanned legs, and more layers of mascara than you can shake a stick at. Everybody looks stunning.

      And then there’s me.

      Today is my first day in my brand-new speaking role, after months of being a random, silent extra.

      Unfortunately, the role I’m playing is Warty Alien. So this morning I’m wearing the most grotesque costume you’ve ever seen in all your life.

      I give it one last go with Frankie the Wardrobe assistant as she passes by my table now, just to see if there might have been some sort of mistake.

      ‘You’re absolutely sure,’ I say, ‘that I’m down on your list as Warty Alien? I mean, there couldn’t have been a spelling mistake? And it isn’t meant to be … I don’t know … Party Alien?’

      See, that couldn’t be too bad. Especially if I could wear one of the alien costumes like my sister Cass wears, in her starring role as one of the Cat People. They’re actually quite sexy – skintight silvery bodysuit, mysterious eye mask, high-heeled knee boots – and even if I had to accessorize it, as Party Alien, with, say, a silly paper hat and a hula skirt, I’d still look halfway decent. Especially if I had to wear a hula skirt, in fact, because it would hide whatever horrors the silvery bodysuit would reveal in the bum region. Two birds, one stone!

      ‘Sorry, Libby. There’s no spelling mistake. Anyway, the part’s not actually called Warty Alien, you know. You’re down on my list as—’ Frankie glances down at the notepad she never lets more than two inches from her sight – ‘Extra-Terrestrial Spaceship Technician.’

      (This basically means that I’m playing an alien version of a Kwik Fit mechanic, and explains why my one and only line – my Big Break! On National Television! – is: ‘But fixing the docking module could take days, Captain, maybe even weeks.’ Look, I never said it was a good line.)

      ‘OK, then,’ I say, desperately, ‘are you sure this is definitely the costume the Extra-Terrestrial Spaceship Technician is supposed to wear?’

      ‘Well, you’re more than welcome to query that with the Obergruppenführer. Because if there had been any kind of an error, it would be her mistake.’

      The Obergruppenführer, otherwise (just not very often) known as Vanessa, is the production manager. It’s probably obvious, from her nickname, that she’s not the sort of person you want to accuse of making mistakes. Particularly not when you’re a lowly extra on a surprise hit TV show, with literally thousands of out-of-work actors ready to kill their own grandmothers to take your job instead.

      ‘Anyway, I don’t know why you’re complaining,’ Frankie adds, over her shoulder, as she sashays in impractical four-inch heels to the bus’s exit. ‘In technical terms, that costume is a work of art, you know.’

      I stare down at the vomit-green latex suit I’ve been sweating into since seven o’clock this morning and pick up the separate alien head that’s sitting on the chair beside me. The head features one particularly giant pustule, right in between the eyes. It doesn’t look like a work of art.

      ‘God, Libby, is that your costume?’

      It’s Cass, squeezing into the seat opposite me.

      And I mean literally squeezing, because she’s some-how managed to inflate her already fulsome cleavage by another couple of cup sizes, and given herself the biggest blow-dry this side of Texas. She’s not changed into her Cat Person costume yet, so the eye-popping cleavage is (barely) contained by a teeny pink hoodie with the zip pulled scandalously low, and I’m quite sure she’s teamed this, as she always does when she’s all out to impress, with either an equally teeny pair of denim cut-offs, or a sassy towelling micro-skirt.

      (We’re half-sisters, by the way. Different dads. Even though the irony is that actually, my dad is the better looking out of the two: her dad, Michael, is a nice-but-nerdy geologist while my dad is as handsome as he is an utter waste of good oxygen. Anyway, Cass is quite definitively the better-looking out of us two: blonde, blue-eyed and curvy while my hair and eyes are from an uninspired palette of browns, my bosom is very nearly non-existent, and the only reason you’d ever call me ‘curvy’ is because I have a sturdy bottom half that’s seemingly impervious to all forms of exercise.)

      ‘Yes, it’s my costume,’ I tell Cass, with as much dignity as I can scrape together under the circumstances. ‘It’s a technical work of art, as a matter of fact.’

      But Cass has already lost interest. ‘So, do I look OK? Do I look better than Melody? Do you think he’s going to notice me?’

      Melody is the lead actress on our (sci-fi, if you hadn’t already guessed) TV show, The Time Guardians.

      The he that Cass is referring to is Dillon O’Hara, our brand-new star. Whose first day on set it is today and who – in case you were starting to wonder – is the reason that everybody has turned up to work this morning in their Saturday Night Best.

      ‘I’m sure he’ll notice you, Cass. You look very eye-catching.’

      ‘You’re sure? Because you do know, don’t you, the kind of girls Dillon normally goes out with?’ To back up her point, Cass rifles in her bag for this week’s copy of Grazia magazine, puts it down on the table next to the script I was given this morning, and jabs a manicured finger at the front cover. ‘That’s the competition.’

      It’s a paparazzi shot of a blonde Victoria’s Secret model – I can’t remember her name, but she’s platinum blonde and buxom, with legs roughly a mile high – exiting a nightclub with Mr O’Hara.

      I hate myself for thinking it, given that the wretched man is keeping an entire cast and crew waiting for him on location this morning while he decides if he can be bothered to show up or not. But he’s annoyingly gorgeous. If you happen to be a fan, that is, of ripped torsos, muscular shoulders and angelic cheekbones. His hair is sooty black, his eyes almost match, and he’s stocky and well muscled in a way that implies not so much a life spent pumping iron while gazing into a gym mirror, but long teenage summers spent working on building sites. Shirtless, probably. Getting an all-over tan on that ripped torso …

      ‘Rhea Haverstock-Harley,’ Cass spits, gazing at the Victoria’s Secret model with loathing. ‘You know she won Hottest Woman in the Stratosphere again in Made Man magazine’s Hundred Hottest list this year?’

      Oh, well, now Cass has reminded me of the name, I do, vaguely, know this. And I also recall that, in a (deliberate? publicity-seeking?) echo of the whole Naomi-Campbell-throwing episode, this double-barrelled Rhea girl got in pretty big trouble a few years ago for hitting her hairdresser with her phone. Which, now that I’ve remembered it, has sort of put me off Dillon O’Hara a bit, even though I don’t think he was going out with her at the time.

      ‘Oh, Made Man,’ I scoff, with a practised air. (Cass didn’t make