All about that new body.

Meghan Trainor flaunted her dramatic body transformation at a movie premiere in Los Angeles on Wednesday, months after admitting to using a weight-loss drug and undergoing a breast augmentation to transform her physique.

The “All About That Bass” singer, 31, walked the red carpet with her husband, Daryl Sabara, ahead of the “Paper” screening, showing off her svelte frame.

Trainor paired a plunging black camisole with short white shorts. Her tiny waist was cinched by an elegant bow featuring a bedazzled buckle.

The pop star completed her look with black pointed-toe heels, styling her blond hair in a wispy updo as long bangs framed her minimally made-up face.

Meanwhile, Sabara, 33, complemented his wife’s ensemble by sporting an all-black outfit.

In March, Trai

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