X17 XCLUSIVE - Lindsay Parties With Her Mom 'Til 2:30am!

Poor Linds is looking a little worse for wear ... but apparently her mom Dina thinks all is well in Lindsayland!

After touching down at LAX yesterday evening around 5:30pm, Lohan and her mom spent a late night out -- going to the Chateau Marmont at 10pm and then over to the Chateau bar at 1:30am for about an hour before heading home. And don't forget these two came from New York so with the jet lag, it was like staying up until 5:30 in the morning! And she's gotta be in a lawyer's office in a few hours!

Our photographer on the scene said: "Lindsay didn't look good. Her face is so puffy and she seemed exhausted. And everyone around is just looking at Dina like, 'why the hell are you partying with your daughter?' Doesn't she see what she's doing and how weird and wrong it is?"

Anyway, you just have to look at Lindsay's face (and her belly) to see the toll all her partying is taking on her young body. If Lindsay won't get a grip and her mom won't help, it looks like dad Michael's the only one who may come to her rescue!