Miley Cyrus' personal trainer thinks people need to ''chill out'' about her figure.

The singer has been sporting a particularly slim and toned body recently and her Pilates instructor, Mari Winsor, says it is because she has been training hard with her for the last four months, rather than dieting.

She told People.com: ''I think people need to chill out. She's healthy and she feels good, that's the main thing. She's smart about her body. She wanted to sculpt her body, that's all.''

Mari added Miley's toned physique is the result of a gluten-free diet and daily Pilates classes.

She added: ''What we focus on with Miley is posture. That was my main concern when she first came to me. I wanted to get her shoulders down and get her to relax her upper body. If you notice, her posture is a lot better.

''She works hard. When this girl comes in, she is on fire. She's focused.''

Miley got engaged to actor Liam Hemsworth on May 31 and is already planning her nuptials, although it is thought they will not be wed until next year.

A source told HollywoodLife.com: ''Nothing has been definite yet. She's just pretty much brainstorming everything about her wedding. I know she wants to have a summer wedding, something on the water maybe.''

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Miley Cyrus - Miley Cyrus' Intense Pilates Sessions