She might be just two weeks away from turning 43, but mother-of-two Jennifer Lopez looks in better shape than ever.

The singer was spotted showing off her stunning bikini body in a tiny red two-piece as she made the most of the Brazilian sights on a trip there at the end of last month.

On The Floor singer Jennifer flaunted her washboard stomach and muscular legs as she enjoyed a day at the beach in Fortaleza with her boyfriend Casper Smart and twin children Max and Emme.

Sexy and they know it: Jennifer Lopez and Casper Smart cuddled up in the sea in Brazil during a break in the country at the end of last month

Red hot: Jennifer showed off her trim figure in a tiny red two-piece while Casper entertained the singer’s two children Max and Emme

He’s a natural: Jennifer’s children, from her marriage to Marc Anthony, appeared to be getting on well with Casper

Jennifer wore her long hair tied back in a high bun as she splashed around in the water, going for a sexy beach chic look by wearing a pair of silver hoop earrings and sunglasses.

Meanwhile, backing dancer Casper showed once again that he is more than comfortable looking after his girlfriend’s children, playing with Max and Emme in the sea, and even picking the little girl up and launching her into the water – much to the tot’s delight.

Despite the fact that Casper seems entirely undaunted by the fact that he may one day become the duo’s stepfather, it was previously revealed that Jennifer is his first serious girlfriend.

Splashing around: Casper drew attention to his vast array of tattoos in a pair of striped board shorts

Toned: The singer, who turns 43 at the end of this month, looked stunning in her bright two-piece

Larking around: Jennifer beamed from ear to ear as she messed around in the sea with her toyboy beau

His father Roy, 58, declared last year: ‘I don’t remember any girlfriends in the past. Certainly nothing serious. He’s been an elusive kind of a guy with girls.

‘He never brought any girl home or anything. I thought he was single but he doesn’t really tell me about his love life.’

And Jennifer and Casper have had to weather a variety of rumours during their relationship, including the most recent reports that the singer shouldn’t trust her 25-year-old dancer beau, who was recently promoted to head choreographer on her Dance Again world tour.

Covering up: After showing off her figure in the sea, Jennifer later covered up her figure in a colourful towel

Mummy and me time: A clearly excited Emme bounded alongside her mother as they made their way back onto the beach

However, Jennifer and Casper have been keeping quiet about their relationship, although the dancer did say in an interview last month that their relationship ‘just spontaneously happened.’

Despite all the claims surrounding their relationship, Jennifer and Casper looked very much in love as they enjoyed the warm weather in Brazil.

Soaking up the sunshine: After frolicking in the water, Jennifer took some time to relax and sunbathe

Sun safe: The singer was also keen to make sure that her man stayed safe in the strong sunlight on the beach

Maternal instinct: Jennifer did her best to ensure that her children were happy and entertained at all times

Calling it a day: Emme carried her Hello Kitty bucket as her mother and the group got ready to head back to their hotel

While Jennifer opted for a sexy red two-piece, Casper drew attention to his vast collection of tattoos by sporting a pair of black, white and red board shorts.

And Jennifer ensured the group all remained safe in the sun by slathering the protection cream on to her boyfriend’s back, as well as ensuring her kids were covered from head to toe.

Following their day at the beach, which saw them alternating sunbathing with frolics in the sea, Jennifer and Casper wrapped up the kids in their towels as they made their way back to the hotel.

Home time: Jennifer covered up in a red T-shirt and white short over her bikini as she carried Max, while Casper took charge of Emme

Motherly love: Jennifer was seen placing a tender kiss on the top of her son’s head as she toted the little boy