Wet and wild! Jessica Mauboy shows off her 8kg weight loss at a Sydney water park with rumoured fiancé Themeli Magripilis - and flashes a HUGE diamond ring on her finger

She lost eight kilograms in just 10 weeks last year.

And Jessica Mauboy was looking more confident than ever during a trip to Wet'n'Wild Sydney with her long-term partner Themeli Magripilis earlier this month.

At one stage, the former Australian Idol contestant leaped in her partner's arms in full view of other visitors at the water park.

Wet and wild! Jessica Mauboy showed off her 8kg weight loss at a Sydney water park with rumoured fiancé Themeli Magripilis earlier this month
Packing on the PDA! At one stage, the former Australian Idol star leaped in her partner's arms in full view of other visitors at the water park

Wet and wild! Jessica Mauboy showed off her 8kg weight loss at a Sydney water park with rumoured fiancé Themeli Magripilis earlier this month

The We Got Love star, 29, showed off her figure in a black swimsuit, and concealed her gaze behind a pair of stylish sunglasses.

She appeared in happy spirits on the day, cuddling up to Themeli and chatting with other friends by the main pool.

Jessica also flashed a large diamond sparkler on her ring finger, sparking rumours the couple are secretly engaged.

Something to tell us? Jessica also flashed a large diamond sparkler on her ring finger, sparking rumours she and Themeli are secretly engaged

Something to tell us? Jessica also flashed a large diamond sparkler on her ring finger, sparking rumours she and Themeli are secretly engaged

Come here, you! Jessica appeared in happy spirits on the day, cuddling up to Themeli and also chatting with other friends by the main pool

Come here, you! Jessica appeared in happy spirits on the day, cuddling up to Themeli and also chatting with other friends by the main pool

Beach bodies: The We Got Love star, 29, showed off her figure in a black swimsuit, and concealed her gaze behind a pair of stylish sunglasses

Beach bodies: The We Got Love star, 29, showed off her figure in a black swimsuit, and concealed her gaze behind a pair of stylish sunglasses

The sighting comes after Jessica's personal trainer Luke Istomin revealed how the singer managed to lose 8kg in just 10 weeks.

Under Luke's guidance, she upped her exercise regime and adjusted her diet so she was eating five healthy meals per day.

'I put her on a strength and movement-based program at Reunion gym in Potts Point and she trains six times a week,' the PT said in November. 

Feeling confident: The sighting comes after Jessica's personal trainer Luke Istomin revealed how the singer managed to lose 8kg in just 10 weeks

Feeling confident: The sighting comes after Jessica's personal trainer Luke Istomin revealed how the singer managed to lose 8kg in just 10 weeks

Changing things up: Under Luke's guidance, Jessica upped her exercise regime and adjusted her diet so she was eating five healthy meals per day

Changing things up: Under Luke's guidance, Jessica upped her exercise regime and adjusted her diet so she was eating five healthy meals per day

Regimen: 'I put her on a strength and movement-based program at Reunion gym in Potts Point and she trains six times a week,' Jessica's PT said in November
Regimen: 'I put her on a strength and movement-based program at Reunion gym in Potts Point and she trains six times a week,' Jessica's PT said in November

Regimen: 'I put her on a strength and movement-based program at Reunion gym in Potts Point and she trains six times a week,' Jessica's PT said in November

Workout routine: Jessica 'does strength three times per week for 50 minutes, and HIIT or cardio two days per week for 50 minutes'

Workout routine: Jessica 'does strength three times per week for 50 minutes, and HIIT or cardio two days per week for 50 minutes'

Luke continued: 'She does strength three times per week for 50 minutes, and HIIT or cardio two days per week for 50 minutes.

'Her strength has improved dramatically. Her confidence improved as well and she's looking great!' 

Luke, who is one of the co-founders of F45 Training, added that drinking plenty of water was also essential to Jessica's results.

'Jess used to only drink 300ml of water a day, which isn't enough,' he said. 'Now she’s drinking close to three litres a day. 

'Water has also helped with her appetite control, helping her feel full. So water plays a big part in weight loss.'

'It helps with appetite control': Drinking plenty of water was also essential to Jessica's results

'It helps with appetite control': Drinking plenty of water was also essential to Jessica's results

Looking good, feeling great! Jessica couldn't wipe the smile off her face during her trip to  Wet'n'Wild Sydney on February 3

Looking good, feeling great! Jessica couldn't wipe the smile off her face during her trip to  Wet'n'Wild Sydney on February 3

Engaged? Jessica has been spotted wearing the same diamond ring on several occasions in recent months, sparking rumours she could be walking down the aisle soon

Engaged? Jessica has been spotted wearing the same diamond ring on several occasions in recent months, sparking rumours she could be walking down the aisle soon

Meanwhile, Luke also revealed at the time that Jessica's new eating plan helped her shed those extra kilos.

'Breakfast is a protein shake straight after the workout, and then she'll make a two-egg omelette with mushrooms and other some green vegetables whens he gets home,' he said.

'At lunch time, she'll have either fish or chicken with vegetables and rice, and change it with up different sauces and flavours.

'She also has her family in the Northern Territory send her down fish, which is her favourite.'

Her dinner usually consists of a stir fry containing vegetables and protein.

Back in the day: Jessica rose to fame in 2006 when she became the runner-up on the fourth season of Australian Idol

Back in the day: Jessica rose to fame in 2006 when she became the runner-up on the fourth season of Australian Idol

Songstress: She is known for her popular songs Burn, We Got Love and Fallin'

Songstress: She is known for her popular songs Burn, We Got Love and Fallin'

Multi-talented: In addition to her singing career, Jessica is an actress with starring roles in films Bran Nue Dae and The Sapphires

Multi-talented: In addition to her singing career, Jessica is an actress with starring roles in films Bran Nue Dae and The Sapphires

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Jessica Mauboy strips down Wet'n'Wild Sydney with rumoured fiancé

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