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Lindsay Lohan may have gotten a very special birthday surprise last night in the form of a punch from Voyeur waitress/Ryan Seacrest ex Jasmine Waltz, but now we know why -- Jasmine hooked up with Danny Cipriani just weeks ago and was jealous that he's now with Lindsay!

Jasmine and Danny first hooked up last month at the same party where Lindsay initially met the rugby player.

But since then, Danny's apparently only got eyes for Lindsay!

A source inside the club tells X17online exclusively that:

    "Last night Danny was all over Lindsay and completely ignoring Jasmine like she wasn't even there. That's when Jasmine got angry at Lindsay and hauled off and hit her! Jasmine probably thinks Lindsay stole him off of her."


But it didn't seem to faze the birthday girl too much. Because she and Danny did nothing to hide their affection, engaging in PDA all night!

"They weren't even being discreet about it," says our source. "They were all over each other and didn't care who saw!"

Lindsay has yet to follow up last night's tweet, "A waitress just hit me - punched me for no reason."

She's either sleeping off the Red Bull or sleeping in with Danny!