Gina Gershon relaxes “Black Bikini” break with her boyfriend on Italia

At 50 years old, Gina Gershon is still quite the 'showgirl'.

The U.S. actress celebrated her milestone birthday by slipping into a bikini and frolicking in the sea.

Looking fantastic in her mismatched two-piece, the Showgirls star was joined by her boyfriend Bobby Kaiser.

 Snap happy: Actress Gina Gershon was toting a waterproof camera to capture a series of underwater snaps as she holidayed in Italy

Making a splash: Gina makes a leap of faith off the boat as she celebrated her landmark birthday

Gershon - who hit the big 5-0 on Sunday - is seen here leaping into the water, camera in hand, before lounging around on deck with her other half.

The pair shared a loving kiss as they lapped up the gorgeous weather and topped up their tans.

Gershon is perhaps most famous for her role as Cristal Connors in 1995 drama Showgirls.

Affectionate display: The Showgirls actress leans in for a kiss from boyfriend Bobby Kaiser

Buoyant: The star is seen swimming around with her underwater camera in hand

She is also a supporting cast member in the HBO series How to Make It in America.

Her most recent film role saw her star alongside Matthew McConaughey in Killer Joe in 2011.

The film - which contains graphic violent and sexual content - will be the focus of a Q&A session next month in New York.

On fine form: The happy couple cooled off by taking a dip in the water

Full steam ahead: The couple were accompanied by a sailor for their trip on the ocean 

 

Looking lovely: Gershon was wearing a black halter-neck bikini top and patterned bottoms

Gershon, McConaughey and director William Friedkin will take part in the event, discussing how the movie was adapted from the Pulitzer Prize and Tony Award-winning play of the same name, by Tracy Letts.

Back in 2008, Gershon was linked to former U.S. president Bill Clinton in a Vanity Fair article.

Drying off: The couple warmed up in the sun as Gina continued to take snaps of the scenic views

Toned: Despite being half a century old, Gina could pass for a woman at least 10 years younger

Ahoy there: The trio look into the distance as they occupy the bow of the boat

But she later dismissed the report as outrageous.

Speaking on Live with Regis and Kelly, she said: 'It is such a crazy, outrageous lie.

'I met him three times at events. [These rumours] disturbed me on so many levels.'