See the singer's changing shape

Christina Aguilera’s weight has been up and down over the years.

Since finding fame in 1999 with her chart-topping debut single Genie In a Bottle, Christina has rocked both curvy and toned frames.

In her younger years, Christina is more than happy to show off her figure in seriously skimpy stage costumes.

In the first picture of our gallery, a fresh-faced Christina can be seen flashing a hint of her toned tummy in 1999 wearing low-slung trousers.

She completes her outfit with a tight bright pink top that only helps to emphasise her gym-honed physique.

Feeling really confident as she performs at a CBS event just a year later, Christina puts her entire stomach on display in a seriously saucy ensemble.

We’d do anything for those abs!

Between 2003 and 2007, Christina continues to flaunt her trim bod in an array of skimpy outfits. After falling pregnant for the first time in 2007, her body naturally changes shape.

She reveals her growing belly as she takes a stroll through LA that year.

After welcoming a son named Max in January 2008, it’s not long before Christina starts shedding the pounds – she stuns as she sashays out of a hotel in New York dressed in a form-fitting frock that May.

Christina is looking a little curvier on her bottom half in May 2011.

The weight continues to creep on and when she hits an awards ceremony that September, she proudly flaunts her round booty in a floor-skimming black gown.

A hip-hugging bodycon and a thigh-split Grecian number are two curve-enhancing looks that follow.

Stepping out at a promo bash for The Voice in November 2013, Christina is virtually unrecognisable with her tiny new frame.

She slips on some skinny jeans and a dainty blouse for the occasion.

Read on to see Christina’s full weight loss story in pictures…