Lindsay Lohan embarked on a dangerous drinking binge just hours after confirming her breakup with girlfriend Samantha Ronson on Monday–and just like in every dysfunctional family, mother Dina Lohan was right by her side.

Spywitnesses at L.A. hotspot h. wood tell RadarOnline that they spied the two-time rehabber–a recovering cocaine addict and alcoholic– chugging down a bottle of Belvedere vodka with loud gulps as her Long Island Lolita of a mother sipped bubbly at the opposite side of the table.

Lindsay then mixed diet soda and vodka and downed several as the night progressed…..Dina, meanwhile, was drinking glasses of white wine, Radar wrote Tuesday.

Last week, the elder Lohan came under public scrutiny after tabloid tattles accused the fortysomething mother of four of trying to go clubbing in Hollywood with her 14-year-old daughter, Ali, in tow.

Well as the old saying goes, the family that parties together, stays together gets a discount on therapy.