She may have toned down her party girl image in recent months but Paris Hilton still knows how to have it large.

The heiress became the centre of attention as she let her hair down while on holiday in Rio de Janeiro this weekend.

Paris, who turns 29 on Wednesday, showed off her dance moves as she promoted a new Brazilian beer called Devassa, which is a slang word for sexy in Portuguese.

Sexy beverage: Paris Hilton promotes a Brazilian beer called Devassa which means sexy in Portuguese

And she certainly proved she could live up to the name as she sexily strutted her stuff at a nightclub last night in a see-through purple dress.

Not that any of the male onlookers seemed to mind, and thankfully, neither did her boyfriend Doug Reinhardt who kept his embarrassment in check as he stood back and give her the limelight.

Bottoms up: Paris looks like she's had one too many as she falls forward on the nightclub floor

Let's party! Paris struts her stuff as delighted clubgoers look on

At one point, she got down on all fours and stuck her bottom in the air as she posed for the cameras, and was all smiles as Doug joined her clutching a can of the beer.

She then grabbed a microphone and paraded onto the nightclub's stage to greet the crowd and give them a show of her dancing.

But despite the late night, Paris was up bright and early to greet Valentine's Day and have a smooch with her boyfriend of almost a year on her hotel balcony.

Her reluctant boyfriend Doug Reinhardt helps her promote the Brazilian beer

She then decided to head to the pool at the on the top floor of the ultra-exclusive Copacabana Palace hotel and gave the paparazzi a real eyeful.

The socialite posed in a tiny black-and-white bikini and leant back against the railings making sure her bottom was in full view.

Paris and Doug have been at the centre of rumours that the baseball star had proposed to her last week, reports that were further fuelled after Paris revealed that she had considered marriage this year.

But her mother Kathy was quick to dismiss the reports and said her daughter 'hasn't mentioned it to me'.

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Cheeky: Paris makes sure the paparazzi get an eyeful of her bottom as she lounges by her hotel pool