Australian jewellery designer Buck Palmer has been soaking up the sun with his supermodel girlfriend Alessandra Ambrosio in Rio de Janeiro.

The pair were all smiles on Monday as they strolled arm in arm through the streets, blending into the laid-back Brazilian lifestyle in coordinated summer outfits.

Alessandra, 43, looked stunning in a white lace crop top paired with flowing pastel-yellow trousers and accessorised with trendy white sunglᴀsses and sandals.

The Brazilian supermodel radiated glamour in the stylish top which highlighted her toned figure, paired with soft, flowing pastel-yellow trousers for a breezy, feminine look.

The Victoria’s Secret Angel’s long, glossy hair cascaded in natural waves and framed her face beautifully and she completed that with understated jewellery.

Meanwhile, Buck kept it casual yet stylish in a crisp white T-shirt, beige trousers, and green Chuck Taylor sneakers, topped off with a green LA-branded cap and aviator sunglᴀsses.

The strolled through the streets and soaked up the vibrant energy of the city before being seen laughing as they posed for a selfie on a H๏τel balcony, with Buck cheekily flashing a peace signal.

Buck’s highly publicised split from Australian model Ashley Hart came in 2017, after two years of marriage.

In December, Alessandra declared her love for new boyfriend Buck in a gushing birthday tribute.

The Victoria’s Secret model and the Australian jewellery designer went public with their romance late last year at a party at Art Basel in Miami.

Alessandra, 43, looked effortlessly stunning in a white lace crop top paired with flowing pastel-yellow trousers and accessorised with trendy white sunglᴀsses and sandals

The pair were all smiles as they strolled arm in arm through the vibrant streets, blending into the laid-back Brazilian lifestyle in coordinated summer outfits

Now, Alessandra has hinted their relationship is getting serious as she took to Instagram to share a loved-up birthday tribute to Buck.

She teased their romance has been going on for quite some time as she shared a huge gallery of smitten pH๏τographs and videos of them both.

Among the slideshow were sweet pictures of them cosied up for romantic date nights and packing on the PDA as they shared a string of kisses.

In a caption, she declared her love for her new partner, whose ex-wife Ashley Hart is the sister of Alessandra’s fellow Victoria Secret model Jessica Hart.

She penned: ‘[Heart] you, birthday boy!!!’

Monday’s stroll was a rare public display of affection for the couple, who have kept their romance relatively private and under wraps until now.

Though they only went public with their relationship earlier this month, it appears the couple have been dating for quite some time if Alessandra’s post is anything to go by.

She had previously featured with Buck in pH๏τographs shared to Instagram of them having fun at the beach during a trip to the island of Kauai in Hawaii.