Sam Smith looks like this now ...

Sam Smith shows off his new look on Instagram.

Sam Smith has shed more than six kilos in two weeks.

The 22-year-old singer has taken to his Instagram account to pay tribute to nutritionist Amelia Freer after he managed to pile off more than six kilos and "completely transform" his relationship with food by taking tips from her book Eat. Nourish. Glow.

He wrote: "Three weeks ago I met a woman who has completely changed my life. Amelia Freer has helped me lose over a stone in 2 weeks and has completely transformed my relationship with food.

"Everyone go check out her incredible book, and start to live healthy. It's not even about weight loss it's about feeling happy in yourself. Love you Amelia & thank you for making me feel so happy inside and out @ameliafreer #eatnourishglow (sic)"

The Stay With Me hitmaker also admitted he has become "obsessed" with yoga after taking part in his first session just yesterday.

He tweeted: "Just been introduced to Yoga for the first time in my life. F***, Im obsessed (sic)"

Sam Smith in an older press photograph.

But the star doesn't look likely to enjoy a session of his favourite new hobby today as he is taking a much-needed rest after revealing his voice is not in tip-top condition.

He wrote: "Day off today. Voice needs it. Still not feeling 100%. Water + sleep + water + sleep (sic)"

Smith is set to play two New Zealand shows at Auckland's Vector Arena on April 23 and 24.

- Bang! Showbiz