Britney Spears 2017 doing the splits
Britney Spears wowed her online fans as she showed off her flexibility during a gym work-out Britney Spears/Instagram

It was like Britney Spears had turned back the clock as she displayed her impressive flexibility and toned tum in new online snaps.

The mum-of-two, 35, treated her 16.4 million Instagram followers to pictures from her gym workout.

One showed the Oops… I Did It Again hit-maker standing in front of a mirror with her taught midriff stealing the frame as she sported tiny white and grey shorts and a low-cut pink crop top.

In another, the sultry star wows as she poses doing the splits.

She wrote alongside the photographs: "Back at the gym… stretch and run all the way."

Her fitness session appeared to come hours after she was honoured with a lifetime achievement gong at the 2017 Radio Disney Music Awards.

Also in attendance at the star-studded annual bash held at the Microsoft Theater in LA was Britney's younger sister Jamie Lynn Spears, 26, who took part in a tribute to the popstar.

Blonde Jamie Lynn along with Kelsea Ballerini, Sofia Carson and Hailee Steinfeld dressed up in some of Britney's most famous costumes from over the years.

Jamie Lynn – whose eight-year-old daughter Maddie Aldridge was involved in a horror ATV crash earlier this year – dressed in a lace-up black catsuit as she mimicked her elder sibling's look for a special performance.

Britney looked emotional as she took to the stage to pick up the Icon Award and was watched on by her sons, Sean Preston, 11, and Jayden James, 10, who were sat in the audience.

Last month Britney's manager Larry Rudolph confirmed that she would be ending her successful Piece Of Me Las Vegas residency on 31 December following a four-year run.

Back at the gym.... stretch and run all the way 💕👙💕💕🌺🌸🎀

A post shared by Britney Spears (@britneyspears) on

He did not, however, rule out a return to Sin City in the future, explaining: "Our next move is undecided. We are still talking with Caesars Entertainment and other interested parties in Las Vegas."

Adding to the Las Vegas Review-Journal: "Anything is possible. Britney basically sells out every show, and she loves Las Vegas, she loves performing in Vegas, and Vegas is a possibility going forward," he added to the Las Vegas Review-Journal."

He also teased the prospect of the songstress heading back into the studio to work on her 10th studio album which would serve as the follow-up to 2016's Glory.

Britney Spears poses alongside Kelsea Ballerini, Sofia Carson, Hailee Steinfeld and sister Jamie Lynn Spears who performed a tribute to her at the 2017 Radio Disney Music Awards. Jamie Lynn Spears/Instagram