Bar Refaeli -- Excuse Me While I Pick This Bikini Wedgie

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Bar Refaeli
Excuse Me While I Pick This Bikini Wedgie

Bar Refaeli had some issues with her bikini riding a little too high up during a yacht trip off the coast of Spain this weekend.

Fortunately, she managed to fix the problem.  Here's the proof:

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Miss Universe 2012 Olivia Culpo -- Planet Earth's HOTTEST Bikini Babe

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Farrah Abraham & Tanning Mom -- Topless Bikini Showdown

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Farrah Abraham & Tanning Mom
Topless Bikini Showdown
Battle of the Bulges
It's the boobie battle you've all been waiting for -- 22-year-old "Teen Mom" porn star Farrah Abraham  (with her brand new D cups) and the legendary Tanning Mom (with her genuine leather speed bags).

It's actually a hilarious coincidence ... Farrah and 45-year-old Patricia Krentcil both posed for topless photo shoots on the beaches of Malibu Thursday.

Malibu beaches are a hot spot for celeb photo shoots, so it's not that surprising they showed up around the same place -- but it's incredible they BOTH decided to drop their tops.

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Ashley Greene & Vanessa Hudgens -- It's Tiny Bikini Time in Bali

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Ashley & Vanessa
Tiny Bikini Time
... In Bali
The sun wasn't the only thing that was hot in Bali yesterday -- Ashley Greene and Vanessa Hudgens went two pieces on the Indonesian island.

The actresses sunned themselves in barely-there bikinis while attending the Oakley Pro Bali surf competition. Ashley even took some surf lessons herself.

We'd say more ... but a picture is worth a thousand words.

Mariah Carey -- BOMBS AWAY ... In Skimpy Bikini

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Mariah Carey
BOMBS AWAY
During Beach Day in Italy Mariah Carey's bikini top successfully held on for dear life as the singer climbed onto her boat off the coast of Italy today.

Damn.

Oh yeah ... Miguel was there, too.

Jamie Lynn Sigler -- Pregnant Bikini Babe

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Jamie Lynn Sigler
Pregnant Bikini Babe
... And We Mean It
Here's ready-to-burst Jamie Lynn Sigler wearing a bikini at a North Carolina beach last week. She's 7 months pregnant ... and we're really kinda into it? Is that weird? $(function() { $('#poll-654-51fca518db8354323f8a244fe6ef6b8a div form ul li') .children() .not($('div.styledRadio')) .filter('input:radio') .screwDefaultButtons({ checked: "url(http://ll-assets.tmz.com/www.tmz.com/default/cache/images/radio_Checked.v2013_04_30_065211.gif)", unchecked: "url(http://ll-assets.tmz.com/www.tmz.com/default/cache/images/radio_Unchecked.v2013_04_30_065211.gif)", width: 20, height: 20, pollid: "654-51fca518db8354323f8a244fe6ef6b8a", }); });

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We gotta ask ...

Lady Gaga -- BACK in Bikini Shape

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Lady Gaga
BACK in
Bikini Shape
Less than a year after gaining 30 pounds, Lady Gaga is back down to her fighting weight -- surfacing south of the border in Mexico this week with some friends ... in a sexy floral bikini.

You'll recall, Gaga struggled with her weight last year, telling Stylist Magazine, "I don't really care if [people] think I'm fat, because, quite honestly, I did gain about 30 pounds."

Gaga also underwent serious hip surgery a few months ago ... so that probably helped with the weight loss too.

Too bad she had to give up that golden wheelchair.