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Heidi Montag is back in her bikini!

The former star of "The Hills" just turned 27 on Sunday (or at least parts of her did) and celebrated by staging a photo shoot in a glittery, gold two-piece.

Never missing an excuse to show off the results of her plastic surgery overhaul, Montag struck a couple provocative poses by the pool.

While Heidi and her husband Spencer Pratt have kept a relatively low profile lately, they have a secret project in the works.

No word on what they've got up their sleeves, but she's been tweeting about it non-stop over the past few days. 

The 27-year-old has come a long way from when we first saw her on "Laguna Beach" and "The Hills"  hasn't she?

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Check out how much Heidi and her for MTV costars have changed since appearing on the show in the gallery above! 

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