Sexy Stars Sippin' Margaritas for National Margarita Day

If the February cold is getting you down, it might be time to follow the example of these stars ... and mix yourself a marg on National Margarita Day!

We've put together a series of stars throwing back a stiff drink or two -- many of them soaking up the sun on sandy beaches -- to get you into the summer sippin' spirit!

Lexi Rivera and Kristina Schulman were in full summer gear while drinking their margaritas ... wearing just tiny bikinis -- though Schulman added a cowboy hat to enhance her ensemble.

There's a ton of ways to make a margarita ... but, regardless of how you like yours, everyone can enjoy these hot pics ...