By Aislin Taylor

Fitness fanatic: Miley Cyrus walked her dog and did Pilates today in LA

She's been looking incredibly thin lately, and the reason may be Miley Cyrus' obsession with exercise.

The 19-year-old starlet was caught out not once but twice today in skimpy workout gear.

This morning she was spotted in tiny Lycra bicycle shorts, a black bra and grey tank top walking her dog in Studio City, California.

Alaskan Klee Kai Floyd led her owner around as they frolicked in the sunshine.

Her legs looked endless in the brief exercise bottoms, which showed off almost too much of her skinny thigh.

Later in the day she changed into a different grey top and black yoga trousers to take a pilates class in West Hollywood.

Disappearing star: The Hannah Montana star has been looking awfully thin as of late

Her flat midriff was on full display, and her hip bones were startlingly visible.

She has been caught out almost daily doing some form of exercise or another.

She has furiously maintained that she is not, in fact, anorexic, after a series of reports suggested that she was suffering from the eating disorder.

Pilates power: The actress attended a pilates class in West Hollywood this afternoon

Leggy lady: The 19-year-old pop star and actress showed off her endless legs in these tiny shorts today

She took to her Twitter page to debunk the rumours, claiming her weight loss was due to a dietary allergy.

Miley wrote: 'For everyone calling me anorexic, I have a gluten and lactose allergy,' she wrote on her Twitter account yesterday. 'It's not about weight it's about health. Gluten is crapppp anyway!'

She told one fan: 'Everyone should try no gluten for a week! The change in your skin, physical and mental health is amazing. You won't go back!'

Miley's frame has been noticeably slimmer lately - in comparison to just seven months ago during a performance on stage in November.

Fans of the former Hannah Montana star became concerned about the star after after she recently tweeted a photograph of herself inhaling the contents of a Carl's Jr takeout bag.

Who wears short shorts? Miley Cyrus wore tiny Lycra jogging shorts while walking her dog in Studio City today

Any excuse to workout: Miley Cyrus was seen taking her dog for a walk and showing off her incredible figure in Los Angeles yesterday

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