Simon Pegg brought happiness to fans in Leicester Square tonight at the London premiere of Hector and the Search for Happiness.
Pegg stars in the comedy drama as a psychiatrist who sets out across the globe to find what makes people happy, and Rosamund Pike, who plays his wife, was also on the red carpet.
Shaun of the Dead star Pegg, 44, admitted people often expected him to be happy all the time as a comedy actor.
"I haven't been on a journey like Hector but I went on my own journey personally. As you grow up and live life you start to figure out what happiness is to you," he said.
"It didn't take me a round the world journey to figure that out. It took having a kid and finding out what I want from life. It's an important thing we've all got to strive to find... and also to realise sometimes that when you're unhappy it might be a prelude to being happy again, it doesn't mean you never will be again.
"I think people assume if you're an actor and work in Hollywood you must be happy. That's not always the case, but I've found my happiness in Hertfordshire, north of London. People expect you to be on all the time but I'd quite like to do more serious stuff now."
One of Pegg's yet-to-be released films is the comedy Absolutely Anything, which he worked on with the late Robin Williams, who committed suicide after a battle with depression.
Pegg said he hadn't met Williams, who had a voice part, on set, but added: "He was an extraordinary man and performer and I think his death just highlights what a serious problem depression is.
"People assume if you live in Hollywood and you're rich and famous you must be happy. That's not what brings you happiness, it comes from somewhere else.
"If anything positive can come from such an awful thing it's that people will maybe take depression a bit more seriously."
Asked if Williams had been a hero of his, he replied: "Absolutely, Mork and Mindy was my favourite show in the seventies. I think he was my first impression when I was a kid, my first impersonation in the playground was Mork.
"So it was a terrible shock to hear about it and also just so sad that he could have reached that point."
Pike, 35, said she could relate to the film's themes: "I'm definitely an adventuress at my core and have gone exploring to see what's beyond, it's usually for the soul enrichment.
"Quite a lot of the time when you finish a film you feel quite emotionally and creatively bankrupt at the end of the process and you feel you need to restock and often it is travel that can refuel the imagination and restock your creative energies."
The film also stars Toni Collette and Stellan Skarsgard, although neither were at the premiere at the Empire in Leicester Square.
Joining Pegg on the red carpet were his long-time collaborator Nick Frost and the film's director Peter Chelsom.
Hector and the Search for Happiness is released in cinemas on August 15.