Today is National Bikini Day, but there are some celebrities who make us wonder if they own anything besides two-piece swimsuits!

Not only do some of the world's hottest celebrities like Kim Kardashian seem to put on a bikini at every possible moment, they constantly post these photos on Twitter and Instagram for the world to see! Check out our round-up of the top celebrity bikini pic oversharers!

1. Kim Kardashian

Kim Kardashian Bikini pic

The ultimate "Look at me!" celebrity seems to post bikini pics of herself on a weekly basis, but she certainly has the body to get attention!

2. Coco

CoCo Bikini Pic

Coco doesn't seem to own much clothing. Her Twitter following came largely in part to her series of "Thong Thursday" pics and this photo shows why they were such a hit!

3. Jenelle Evans

Jenelle Evans bikini pic

The Teen Mom star doesn't seem to live near a beach, but that hasn't stopped her from posting plenty of bikini pics while hanging out at home!

4. Kate Upton

Kate Upton pic

We all know why Kate is so popular these days. She does too and has no problem giving us the goods!

5. Tyra Banks

Tyra Banks bikini pics

She may be judging photo shoots instead of taking part in them these days, but Tyra still knows how to strike a fierce pose in a bikini!

6. Miranda Kerr

Miranda Kerr bikini pic

The Aussie hottie and Victoria's Secret Model posted this super hot bikini pic just last week!

7. Kendra Wilkinson

Kendra Wilkinson bikini pic

The reality star and former Playboy model has never been known for modesty and her ample supply of bikini pics she posts on Twitter is a prime example of that!

8. Gabrielle Union

Gabrielle Union bikini pic

Gabrielle's Twitter account lets the world know (over and over again) that she's turning 40 this year and can still look smoking hot in a bikini!

9. Aubrey O'Day

Aubrey O'Day Twitter

The former Danity Kane star will do anything for attention, including walk the red carpet in a bikini!

Photos courtesy of Instagram and Twitter

So who do you think is the worst bikini oversharing offender??