If you're single, stop reading this post now. It's just going to make you depressed.

Your friends aren't the only ones who shared photos of flowers, candy and other Valentine's Day surprises on Facebook and Twitter ... the stars did too. And they're doing it bigger and better.

Celebs posted photos showing hundreds of red roses, stolen kisses, sexy lingerie and some sweet treats all day long.

But none shared more than Mariah Carey.

The singer and her husband Nick Cannon started their celebrating a day early and kept posting pictures all day on Thursday.

The diva chronicled everything from taking a bath with her dog (seriously) to a horse dung "scented" carriage ride through Central Park.

Check out the gallery above to see how stars like Sofia Vergara, Jamie Lynn Spears, Lauren Conrad, Mariah CareySelena Gomez, Justin Bieber and more also celebrated the holiday.

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