Victoria Beckham has a ''stressful'' job.

The fashion designer - who has children Brooklyn, 14, Romeo, 11, Cruz, eight, and Harper, two, with husband David Beckham - doesn't mind feeling under pressure in her work as she loves her job so much, she uses the energy in a ''positive'' way.

She said: ''It does get stressful, but I'm so blessed to have a job that I love so I can turn that stress into positive energy.

''I have loved design since I was kid. It's incredibly fulfilling to have a career pursuing a lifelong passion.''

The former Spice Girls singer also admitted her pop background made it difficult to pursue her dream career.

Asked during a Twitter Q&A with Skype what the biggest challenge she had faced was, she said: ''Coming from a completely different industry is what I found the hardest.''

Though she has won a string of awards for her critically-acclaimed fashion collection, Victoria feels ''proudest'' when she passes women in the street wearing her clothes.

She said: ''My proudest moments as a designer are seeing women in the street wearing my clothes, it makes it real!''