Sebastian Stan enjoys a romantic retreat with girlfriend Alejandra Onieva in Tulum, Mexico

Sebastian Stan gets wet and wild with bikini-clad girlfriend Alejandra Onieva on a romantic retreat in Tulum, Mexico

Winter’s never looked so warm.

And Sebastian Stan got wet and wild with girlfriend Alejandra Onieva in Tulum, Mexico on Sunday afternoon.

The 38-year-old actor slipped off his shirt to wade in the waves with his bikini-clad lady love while on a romantic retreat in the Mexican state of Quintana Roo on the Yucatán Peninsula.

Heating up: Sebastian Stan got wet and wild with girlfriend Alejandra Onieva in Tulum, Mexico on Sunday afternoon

Heating up: Sebastian Stan got wet and wild with girlfriend Alejandra Onieva in Tulum, Mexico on Sunday afternoon

The Marvel Cinematic Universe hero looked ripped and showed off his impressive abs while walking along the sand without a shirt.

He opted to wear a pair of black board shorts with dark green paneling along his thighs and a drawstring tie below his belly button.

Sebastian, who stars in the MCU as the Winter Soldier, showed off scruffy stubble on his face to match his dark brown spiky hair.

Alejandra, 28, looked sensational in a tiny two-piece as she flaunted her tan lines while playing in the ocean. 

Pecs appeal: The actor, 38, slipped off his shirt to wade in the waves with his bikini-clad lady love while on a romantic retreat in the Mexican state of Quintana Roo on the Yucatán Peninsula

Pecs appeal: The actor, 38, slipped off his shirt to wade in the waves with his bikini-clad lady love while on a romantic retreat in the Mexican state of Quintana Roo on the Yucatán Peninsula

Beauty on the beach: Alejandra, 28, looked sensational in a tiny two-piece as she flaunted her tan lines while playing in the ocean

Beauty on the beach: Alejandra, 28, looked sensational in a tiny two-piece as she flaunted her tan lines while playing in the ocean

Swimsuit season: The High Seas star rocked a pink-and-white tie-dye set

She wore a triangle top and matching cheeky bottoms which highlighted her curves

Swimsuit season: The High Seas star rocked a pink-and-white tie-dye set

Casual: Onieva wore her dark blonde hair in natural waves and kept her accessories to a minimum aside from a host of bracelets on her wrist

Casual: Onieva wore her dark blonde hair in natural waves and kept her accessories to a minimum aside from a host of bracelets on her wrist

The High Seas star rocked a pink-and-white tie-dye set with a triangle top and matching cheeky bottoms which highlighted her curves.

Onieva wore her dark blonde hair in natural waves and kept her accessories to a minimum aside from a host of bracelets on her wrist.

Once the couple made their way into the ocean, they cuddled up and kissed in the water before jumping in the waves.

Alejandra and Sebastian have reportedly been dating for six months and were spotted canoodling earlier this summer in Ibiza. 

He must work out: The Marvel Cinematic Universe hero looked ripped and showed off his impressive abs while walking along the sand without a shirt

He must work out: The Marvel Cinematic Universe hero looked ripped and showed off his impressive abs while walking along the sand without a shirt

Sun seeker: Alejandra showed off a tattoo on her torso as she cooled off in the water

Sun seeker: Alejandra showed off a tattoo on her torso as she cooled off in the water

A look: Sebastian, who stars in the MCU as the Winter Soldier, showed off scruffy stubble on his face to match his dark brown spiky hair

World traveler: She's from Madrid, Spain, and reportedly speaks three languages

A look: Sebastian, who stars in the MCU as the Winter Soldier, showed off scruffy stubble on his face to match his dark brown spiky hair

Bliss: Once the couple made their way into the ocean, they cuddled up and kissed in the water before jumping in the waves

Bliss: Once the couple made their way into the ocean, they cuddled up and kissed in the water before jumping in the waves

So happy together: The couple frolicked in the warm waters together

So happy together: The couple frolicked in the warm waters together

Stan’s popular character will be featured in the new Disney+ series, The Falcon and the Winter Soldier, which follows the adventures of Sam Wilson and Bucky Barnes.

In a new clip released by the Latin market of the popular Disney brand, Anthony Mackie and Sebastian Stan discuss what’s to come for their characters post Captain America.  

The Gossip Girl star has a total of six projects in development in the coming years, including a high-profile spy thriller called 355.

He’ll work alongside Jessica Chastain, Penélope Cruz, Diane Kruger, Lupita Nyong’o, Edgar Ramírez and Bingbing Fan. 

Superhero: Stan's popular character will be featured in the new Disney+ series, The Falcon and the Winter Soldier, which follows the adventures of Sam Wilson and Bucky Barnes

Superhero: Stan’s popular character will be featured in the new Disney+ series, The Falcon and the Winter Soldier, which follows the adventures of Sam Wilson and Bucky Barnes

Busy guy: The Gossip Girl star has a total of six projects in development in the coming years, including a high-profile spy thriller called 355

Busy guy: The Gossip Girl star has a total of six projects in development in the coming years, including a high-profile spy thriller called 355

source: dailymail.co.uk