Kathy Griffin and Michelle Trachtenberg are certified go-go gals!

The self-described D-lister and her "Gossip Girl" pal were spotted at popular gay bar The Abbey in West Hollywood over the weekend -- where they jumped up on a table and started dancing with the go-go boys.

We're told they shook it for about 15 minutes -- and were getting $20 bills stuffed into their tops the whole time.

The two made about $300 total and instead of pocketing their tips, they donated them to the bar's service staff.

Check out all the fun photos above!

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