Jennifer Lopez Goes Big for Twins' Bday ... Tips Big Too!!!

2/23/2018 9:35 AM PST

Jennifer Lopez Leaves $5,500 Tip for Twins' Birthday Party

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J Lo went all out for her twins' 10th birthday party ... and she took REALLY good care of the people who helped throw it.

Jennifer put on a bash for more than 30 guests at the Sugar Factory in Las Vegas Thursday night to celebrate Max and Emme's bday. We're told the party arrived around 5 PM and threw down for FOUR hours ... and made good use of their time.

Well-connected sources tell us the bill was $7,500 and included custom cakes for each child -- red velvet Mario Bros. cake for Max and chocolate sloth cake for Emme. They also gorged on virgin gummy worm goblets, and a King Kong Sundae ... with 24 scoops of ice cream topped with sparklers!

We're told J Lo had a blast dancing and spoiling her kids, solo. Their dad, Marc Anthony, wasn't there ... and ditto for A-Rod. We know she was happy about the whole production, because she tipped $5,500!!