If you could step back in time, what would you tell your 16-year-old self?
That’s the premise of a new book, Dear Me, in which numerous celebrities write letters to their teenage selves.
From the hilarious to the heartfelt, here are some of their nuggets of wisdom. . .
Sarah Ferguson, Duchess of York
I am so full of admiration for you, dearest girl, for all your honesty and for knowing your feelings.
You are like a pioneer lady, branching out to new horizons, to pastures new. Wow, you really are brave and courageous.
'Golden-hearted': Sarah Ferguson today and, right, at 16-years-old
You are a special and golden-hearted beautiful redhead with a magical figure and a father and sister who adore you.
I know you think you have done something stupid, and have failed yourself, your parents and you did not go to the same boarding school as your other friends, so you thought you were stupid. I am here to tell you, you are a star.
Kathleen Turner, actress
You will be told that your dreams are absurd childish fantasies. Don’t believe anyone, however much they mean well.
Now and then: Kathleen Turner would tell her younger self to trust in her dreams
Trust that core that tells you your dreams are true. This is very hard because you have no way of knowing yet that they are, but rely on that damned stubbornness you are told is a fault.
Gillian Anderson, actress
You are completely and utterly self-obsessed.
Don't be so self-obsessed! Gillian Anderson would tell her younger self to follow her dreams and not her boyfriends
If you spent a quarter of the time thinking about others instead of the way you hate your thighs, your level of contentment and self-worth would expand exponentially.
PS: Follow your dreams, not your boyfriends.
'Be prepared': Jerry Springer
Jerry Springer, TV presenter
Don't bother making plans as to what you are going to be because you have little, if any, control over it.
Life is a surprise. Just be skilled, smart and prepared.
Michael Winner, film director and restaurant critic
The old adage ‘if you don’t succeed at first, try again’ is as good as they come.
Those who rise to it, achieve something; those who do not, who fail to create opportunities or let opportunities pass them by, are doomed to bitterness and failure.
Or in simple English vernacular, pull your finger out!
Hugh Jackman, actor
There will come a time when you get over Penny dumping you at the bus stop.
In fact, you’ll see her in a couple of years and wonder why you cried every time you heard the Lionel Ritchie song, Penny Lover.
PS: Buy shares in Google when it is invented.
Graydon Carter, Vanity Fair editor
Regarding the raging hormones, the skinny wrists and ankles, the hair so thick that your mother tells the barber to thin it out — put them out of your mind.
None of these will be a long-term problem. Always carry a handkerchief.
Alice Cooper, rock star
Trashy girls are exciting for just about five minutes.
Get a church girl and open a coffee chain: Rocker Alice Cooper was a lot cleaner cut in the days when he was known as Vincent Furnier (left)
Keep your eye out for a really good lookin’ church girl. Then you’ll have the best of both worlds.
PS: I think coffee shops might really catch on, maybe call them Star something . . .
Alan Cumming, actor
A teacher at drama school is going to tell you that you’ll never make it as a professional actor. He is wrong.
Wrong to say it, and just wrong because you do OK. Try not to let it dent you too much.
Stay strong: Actor Alan Cumming's words of wisdom to his younger self
Stephen King, best-selling novelist
It’s simple really, just five words: stay away from recreational drugs.
If you don’t heed this letter and change the future, at least ten years of your life — from 30 to 40 — are going to be a kind of dark eclipse where you disappoint a lot of people and fail to enjoy your own success.
Drug addiction: Steven King's entry to himself is darker than the other celebrities, going into details about his drug problems
You will also come close to dying on several occasions.
Jodi Picoult, author
Calculus. Trust me, you will never use it.
Dannii Minogue, singer and former X Factor judge
All that hard learning to sew with your grandma will come in handy when you start a fashion label with your best friend in London.
Deny how much hairspray you used: Dannii Minogue's advice to her younger self is firmly centred on fashion
PS: Neon bobbie socks are not cool, and will never be back in fashion.
Deny, deny, deny when asked how much hairspray you’ve used.
Your teen hairdos may be responsible for part of the hole in the ozone layer.
James Belushi, actor
Love and marriage: James Belushi offers love advice to his younger self
I don’t know what to tell you about women except they can be very beautiful — very fun — but you don’t have to marry every one you sleep with. It gets costly.
William Shatner, Star Trek actor
If you are not thinking about girls, you are thinking about football.
Well, let me tell you it all works out. The girl finally tells you she loves you, the stage awaits you and is your forum, and I’m sorry, but football is not your calling.
Forget football, it's the stage for you: William Shatner tells his 16-year-old self to welcome his calling
My word of advice to you, my son, my boy, is to live in the moment.
Enjoy those feelings of inadequacy, enjoy your hormonal disorder, live in your youth because it passes too quickly.
What will be, will be. Enjoy the music of your life because once the band stops playing, that’s it.
James Woods, actor
Call someone in your family every day of your life. You may think it tedious to do so, but the time will come when you would give your life to make that call one more time.
'Listen to your grandmother': Piers Morgan
Piers Morgan, broadcaster
Always heed the following advice from family:
From your grandmother Margot: ‘One day you are cock of the walk, the next a feather duster.’
From your mother Gabrielle: ‘Ambition knows no bounds.’
From your father Glynne: ‘Always be nice to policemen and drink the finest French wine you can afford.’
From your Army colonel brother Jeremy: ‘Remember the seven Ps, prior planning and preparation prevents p**s-poor performance.’
From your older self: ‘Don’t take anything too seriously.’
Jimmy Wales, Wikipedia founder
Boo! Did I scare you? I’m you, from the future. You’re a bright guy, but you don’t always trust your instincts.
Go for it. Every time you’ve doubted yourself and failed to act, you’ve seen later that you were right and could have got to where you got eventually much sooner.
When you have an idea, implement it. Don’t wait until you’re sure so you won’t have a failure. Instead, fail faster.
Alan Rickman, actor
If, in future years, anyone asks you to give advice to your 16-year-old self, don’t. Make your own unique messes, and then work your way out of them.
■ Dear Me: More Letters To My Sixteen-Year-Old Self, edited by Joseph Galliano, is published by Simon & Schuster (£12.99).
Compiled by Glenys Roberts