Pregnant Kim Kardashian rubs her aching back and neck filming KUWTK

It's one of the world's most idyllic holiday destinations.But Kim Kardashian didn't seem to be enjoying the delights of St Barts as she trudged around the Caribbean island on Monday.

For rather than relaxing on the isle's famous white sandy beaches, the five-months pregnant star was filming yet another episode of her reality show.

And the strain showed as an obviously uncomfortable Kim rubbed her aching back and neck.

No vacation: Kim Kardashian didn't seem to be enjoying the delights of St Barts as she trudged around the Caribbean island on Monday, joined by sister Kourtney, right

Mother-to-be: Kim kept a hand on her back, supporting the weight of her bump

With a look of discomfort that her fellow mothers will surely sympathise with, Kim kept a hand on her back, supporting the weight of her bump.

Dressed in a black maxi dress, the 34-year-old had switched her usual high heels for a pair of low wedges in a concession to her pregnancy.

But in a push up bra and full make-up, Kim certainly didn't look comfortable. 

Family trip: Sisters Kendall and Khloe joined Kim on the Caribbean isle

Someone call the masseuse! Kim looks in need of a bit of pampering

With her eagerly awaited second child not due until December, Kim is still working hard on the family show and her myriad other business interests.

And the trip to St Barts is obviously no babymoon, with a full camera crew following her around.

Husband Kanye West was not seen on the trip.

Instead Kim shopped with her sisters Khloe, Kourtney, Kendall and Kylie and their mother Kris.

On foot: Kim sensibly decided against riding a dune buggy, instead walking between stores

What would Kanye say? Without her style-obsessed husband's input, Kim decided against buying anything

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Hard at work: The Kardashian girls were filming an episode of Keeping Up With The Kardashians

Kim's daughter North and Kourtney's children Penelope and Mason were also seen out and about on the island.

The gang looked at children's clothes and picked out scarfs and traditional items as they perused the stores. 

Kendall and Khloe then hopped onto buggies as they made there way between stores.

Kim, who is expecting a son, more sensibly chose to walk, joined by her sister Kourtney.  

The fame-hungry family is currently filming the 11th season of Keeping Up with the Kardashians, which premieres this fall on E!

All the gang: Even model-of-the-moment Kendall found time to join the trip