Elsa Pataky - Pregnant Pataky's Flume Ride Fun

The famous foursome is on vacation on the Caribbean island of St. Barts and have spent most of their time soaking up the sun on a luxury yacht.

And despite announcing earlier this week (beg16Jan12) that she's expecting her first baby with husband Hemsworth in the spring (12), Pataky was determined not to miss out on the fun when the vessel's owners set up a huge inflatable flume from the deck to the sea.

She was pictured gasping with delight as she hurtled down the chute while wearing a maroon-coloured bikini, before splashing into the ocean.