0107_nph_launch Neil Patrick Harris knows how to party!

The "How I Met Your Mother" star posted a series of hilarious photos via Instagram from his margarita-fueled adventure while on vacation with his family in Mexico. 

The actor decided to celebrate his last day on vacation by seeing how many frosty drinks he could down in one afternoon. 

"Last day of our Mexico adventure. Let's see just how many margaritas I can drink. Cheers!," he posted with the first photo of him sipping the tasty beverage. 

But as the day goes on (and the drinks go down), Neil starts to get a little sloppy. His last pic from the day shows him faced down in the sand. 

"Magachita #3, 4 mebbe? : Bruuuglah dret scruh nuu rezzlooshun! Nigh nigh nowh. #annndblackout," he captioned the final photo. 

We think the actor must have lost count ... judging from the rest of the photos Neil may had more drinks than he seems to remember. 

Now this is how you celebrate your last day in Mexico -- click "Launch Gallery" above to see all the hilarious pics from NPH's wild vacation! 

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