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Wowzer! Can you believe she's going to be 33 tomorrow?

On Saturday evening Paris Hilton had an early birthday celebration at Greystone Manor in West Hollywood, and naturally, she wore a super sexy outfit to the club. P's real bday isn't until Monday, but we have a feeling she'll be celebrating allllll week long.

After DJing at the club the heiress tweeted, "#YES! #Killedit tonight with my set at @Greystone_Manor! Never seen LA rage so hard at an LA club! So happy you all loved my set so much!"

Paris Instagrammed the above shot and wrote, "Yes! I know! My dress has a very high cut slit! And that's because it's a dress straight off the runway! I saw it in my friend @AlonLivne's #NYFW fashion show & I just knew it would be the perfect #Birthday dress! Loves it! #CoutureRunwayBarbie."

We think she looks great, and you know what they say -- if you've got it, flaunt it!