Pop songstress Katy Perry always starts her day with transcendental meditation as it puts her in the "best mood".

The 'Firework' singer likes to practice the technique before she starts to tackle her super busy schedule.  

She said: ''I start the day with transcendental meditation. It puts me in the best mood. I wake up and just prop myself up in bed for 20 minutes. It's the only time my mind gets absolute rest.

"When I'm asleep, my subconscious mind is switched on and, when I'm awake, I'm alert.''

28-year-old Perry also has another way she beats tiredness throughout the day.

She added to Britain's Marie Claire magazine: ''Like everyone I have a four o'clock slump. I take vitamins after lunch and they give me an energy boost.

She went on to explain: "I have iron, vitamins B, C and D and probiotics, which help with my digestion.''