She puts in plenty of hours to get her body looking good, so it's no surprise Kim Kardashian takes any opportunity to show it off.

The reality TV star flaunted her hard-earned shapely frame in a series of bikinis during a visit to Costa Rica this week, including a purple patterned swimsuit and a white two-piece.

Her fitness regime includes regular 6am workouts complete with a two-mile run, sit-ups and squats.

She is enjoying a romantic getaway with her American footballer boyfriend Reggie Bush, putting to rest fresh rumours the pair are on the verge of breaking up.

Fun in the sun: Reggie Bush and Kim Kardashian holidaying in Costa Rica

Two U.S. tabloid magazines claimed last week that Kim's relationship with the NFL player is under strain, and that she is pressuring him into marriage.

But she insists there is no truth to the reports.

'Reggie and I have never been happier,' she wrote on her website. 'I am in no rush to get married nor do I need to get married to be happy in my relationship. Reggie and I are perfectly fine!'

'Everything's fine!' Kim denies new claims the pair are on the verge of splitting

The pair are preparing to move in together after buying a $4.8million five-bedroom villa in Beverly Hills last month.

The Tuscan-style home, which is 4,000sq ft large, also includes four bathrooms, a spa, a swimming pool and media room.

The Keeping Up With The Kardashians star started house-hunting in October after she reunited with Bush following a four-month split.

She put her West Hollywood three-bedroom condominium up for sale for just over $1million, while Bush listed his $5million Hollywood Hills home.

Body of work: The reality star put her shapely figure on show