Pregnant Kate Hudson Flaunts Bod in Tiny Bikini, Sheer Caftan

Sheer baby joy!

Pregnant Kate Hudson is feeling anything but shy about her ever-expanding belly.

Hanging out in sunny Paraty, Brazil on Monday, actress, 31, flaunted her bod in a black micro-bikini, which a see-through caftan did nothing to conceal.

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Joining Hudson for her fun in the sun was her baby-to-be's dad Matthew Bellamy, who's been touring South America with his band Muse as the opening act for U2.

Hudson and Bellamy, 32, got together last spring, and have been inseparable since she confirmed her pregnancy back in January. But don't expect wedding bells for the couple.

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"I don't feel it necessary to get married," Hudson explained on British chat fest the Graham Norton Show in January.

"I am 31, I already have one child, and have had one divorce, so it is not necessarily the golden ticket. I just want to be happy," added the Oscar-nominated actress, who shares son Ryder, 7, with ex-husband Chris Robinson of the Black Crowes.

PHOTOS: How Kate debuted her boob job last year

"She is happy for Ryder to finally have a brother or sister," a Hudson insider told Us Weekly, which broke news of her pregnancy in early January.

Bellamy gushed about his love while accepting a Grammy award in February -- thanking "my beautiful pregnant girlfriend" at the podium.

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