Britney Spears frolics aboard a luxury yacht

Looking tanned and toned, it seems as though Britney Spears may have finally put her turbulent weight-gain years behind her.

Wearing a tiny green bikini, the singer showed off her curves - and her tattoos - as she spent Saturday relaxing on board a yacht in Sydney Harbour.

Britney, 27, was posing on millionaire media owner Paul Ramsay's boat, Oscar, as she marked the halfway mark on her first Australian tour.

Toned: Britney Spears on board Oscar, moored at Camp Cove

It was clear to see that her arduous training and workout routines have paid off as she boasted a trimmer figure.

After cruising the harbour, the yacht moored at Camp Cove off Watsons Bay for lunch.

It's the same boat on which Lady Sonia McMahon spectacularly fell and broke her ribs earlier this year.

Britney Spears

Lunchtime: Britney eats sandwiches after cruising around Sydney Harbour

Snapped eating sandwiches and salad and drinking Vitamin Water, Britney was relaxing with her sons Sean Preston, four, and Jayden James, three, and her manager boyfriend Jason Trawick.

However, she has been at the centre of controversy after it was revealed that the Gimme More singer mimed on stage during her tour.