Lindsay Lohan and Samantha Ronson were both at Timbaland's birthday party last night at Drai's (along with Paris and others) -- partying side-by-side even though Lindsay reportedly threw a glass at her ex last weekend.

Lindsay arrived with her entourage and Sam arrived with rocker Julian Perretta.

Lindsay tweeted later in the night, "I'm pretty sure that @samantharonson just threw a fit @33years old and my friend tal @draishollywood illegally open NOW at this hour Asked me, after being here jus for Timbalands birthday-to leave even though she stayed over just 2nights ago-tired of @samantharonson Playing the innocent card, while chatting to tmz just like my ex-father, when all I've ever done is fall for a girl."

Ooooh, Sam's still sleeping over? Or is this just another batch of incoherent Twitter babble from Lindsay?