Jennifer Lopez in crop top in Rio with Casper Smart after her dressing room was robbed

Jennifer Lopez looked in high spirits as she flashed her stomach in a crop top when she arrived in Rio de Janeiro with her beau Casper Smart yesterday.

Her composure was admirable considering the day before she had been robbed almost immediately before going into concert.

Jennifer Lopez, 42, looked completely relaxed, dressed down in pale jeans, sandals, a loose knitted cardigan, and a scarf.

She accessorized with her trademark gold hoop earrings, sunglasses and a chunky red studded bracelet, while Casper Smart kept things simple in jeans and a white t-shirt.

J Lo was certainly shown a warm welcome, and was showered with gifts including a t-shirt and flowers as she arrived.

The reception must to have come as some comfort to Jennifer Lopez, who has had a difficult few days in South America.

Jennifer Lopez ran into a spot of trouble on Thursday when she was robbed just after leaving a clinic where she was being treated for a stabbing pain in her back.

During her concert a few hours later at the GEBA stadium in Buenos Aires a thief reportedly stole personal items including computer, a camera and a bag with personal documents from her dressing room.

J Lo’s manager Benny Medina is now apparently unable to leave the country, since he has lost all forms of identification.

It seems J Lo’s back pain was related to her children.

Jennifer Lopez took to Twitter to explain, writing: “Got an xray this morning…all good…pulled back muscle.’

“Coconuts getting to big to carry both at once. Awww… #timeflies 🙁 “

Ever the professional, Jennifer Lopez still performed her two-hour concert the same evening, belting out hits such as Get Right, Let’s Get Loud, Waiting for Tonight and Jenny From the Block.

Meanwhile the singer has been warned off her toyboy beau- by none other than Casper Smart’s “best friend”.

Back-up dancer Josh Ayers says J Lo shouldn’t trust him as far as she can throw him.

“He’s willing to do whatever Jennifer wants as long as it furthers his own career,” Josh Ayers told In Touch Weekly.

Josh Ayers was reportedly close to Casper Smart for years, and claims he has seen first hand how the heartthrob manipulates women to get what he wants.

Before Casper Smart hooked up with Jennifer Lopez, he was with steady girlfriend Aisha Francis for two years.

According to Josh Ayers, it was Aisha Francis who helped land Casper Smart a dance gig on Jennifer Lopez’s music video, Dance Again – where the pair first met.

Casper Smart, who has been reportedly showered with gifts by the mother-of-twins, said in an interview last month the relationship he has with Jen “just spontaneously happened”.