"Happiness is health and a short memory," so says Audrey Hepburn.
If you ask Dolly Parton, the key to happiness is finding out who you really are, while Pablo Picasso recommends finding what you love and doing it for a living.
From great family and friends to living in the moment, helping others, self-sufficiency and appreciation... If you're on your own journey of happiness discovery we've gathered the top tips, quotes and motivational advice from authors, actresses, singers and other high-profile figures to help you along the way.
Although we may see these personalities as eternally joyful and constantly beaming, many of them mention their happiness being something they've had to work at.
Enjoy their words of wisdom and don't forget to smile:
Picture Credit: Rex Images
"I heard a definition once: Happiness is health and a short memory! I wish I'd invented it, because it is very true."
"Find out who you are and do it on purpose. If you want the rainbow you've got to put up with the rain."
"I'm always happy when I'm surrounded by water. The ocean makes me feel really small and it makes me put my whole life into perspective… it humbles you."
"Living in America for six years was the happiest I think I've ever been. I'm a very driven, ambitious, positive person.
"I believe in creative visualization. So for me to go to America - which I find such a positive place - well, I took to it like a duck to water."
Multimedia artist, singer-songwriter, peace activist
"I relate to happiness as an ecstatic moment – something you don’t create, you encounter."
"Never permit a dichotomy to rule your life, a dichotomy in which you hate what you do so you can have pleasure in your spare time.
"Look for a situation in which your work will give you as much happiness as your spare time."
"I think happiness is what makes you pretty. Period. Happy people are beautiful."
Daphne du Maurier
English author and playwright
"Happiness is not a possession to be prized, it is a quality of thought, a state of mind."
"I thought material things would bring me happiness, which they didn't. But through this, I have learned what things are important and what aren't."
"I'm blessed with a great family and great people around me that would be able to kick my butt if I ever for one minute got lost up in the clouds. I've been really lucky in that sense."
Sex And The City author
"The women I know who have children and have careers, they seem to be very happy. They love their children and they love their jobs.
"But happiness comes out of being willing to do your work and find out who you are, what you love."
"The consuming desire of most human beings is deliberately to plant their whole life in the hands of some other person. I would describe this method of searching for happiness as immature.
"Development of character consists solely in moving toward self-sufficiency."
Eat, Pray, Love author
"You need to select your thoughts just the same way you select your clothes every day. This is a power you can cultivate."
"Do things that make you happy, within the confines of the legal system."
Chat show host
"Happiness is there for the taking.. and the making."
"Derive happiness in oneself from a good day's work, from illuminating the fog that surrounds us."
Jamie Lee Curtis
"I think that happiness comes from self acceptance, we all try different things and we find some comfortable sense of who we are. We look at our parents and learn and grow and move on. We change."
"My greatest beauty secret is being happy with myself. I don't use special creams or treatments - I'll use a little bit of everything.
"It's a mistake to think you are what you put on yourself. I believe that a lot of how you look is to do with how you feel about yourself and your life. Happiness is the greatest beauty secret."
British journalist and political aide
"Friends have suggested that I am the least qualified person to talk about happiness, because I am often down, and sometimes profoundly depressed. But to know happiness, it helps to know unhappiness."
Founder of the band Foo Fighters
"My mother was a public school teacher in Virginia, and we didn't have any money, we just survived on happiness, on being a happy family."
"Ever since I was a kid, I’ve always thought it very important to be happy inside.
"There’s a lot of bad things happening in the world, but it’s important to try to stay happy and appreciate what you’ve got, and don’t look externally for the happiness."
US talk show host
"I have found that the only thing that does make you happy is doing something good for somebody who is incapable of doing it for themselves."
"In South Korea, they believe that when you turn 60, you become a baby again and the rest of your life should be totally about joy and happiness and people should leave you alone and I just think that that’s the height of intelligence."
"The mantra that you're given in Transcendental Meditation you keep to yourself. The reason being, true happiness is not out there, true happiness lies within."
"Each morning when I open my eyes I say to myself: I, not events, have the power to make me happy or unhappy today. I can choose which it shall be.
"Yesterday is dead, tomorrow hasn't arrived yet. I have just one day, today, and I'm going to be happy in it."