The 77-year-old had joked: "Lindsay Lohan said she wouldn't mind being under oath because she thought Oath was a Norwegian ski instructor."
"Lindsay Lohan is so dumb. Her idea of being sworn in is cursing at the judge. I was reading about the Lindsay Lohan diet ... all liquid. 80 Proof."
Those were pretty good. But SamRo was not pleased.
"Hey Joan Rivers you have collagen older than Lindsay, pick on someone your own age, oh wait, I guess people that old can't hear," she Tweeted.
Lindsay Lohan, who dated Sam for over a year, thanked her ex for defending her, tweeting: '@samantharonson thank you ;) I love yams x'.
Joan Rivers is not a big fan of Lindsay Lohan. Then again who is? Not us.
Still, some of her recent criticism was a tad over the top.
The alleged actress was recently sentenced to 90 days in jail by a judge in Beverly Hills for violating her probation and must surrender July 20.
Since the judge laid the smack down last week, Lindsay has been seen out and about with mom Dina, sister Ali and "close friend" Eilat Anschel.
Lohan appeared relatively upbeat, saying "thank you" when a passer-by gave her some words of encouragement, but Dina admits she's scared.
Sources say she plans to appeal the sentence, but given her track record with probation and the fact that she's totally guilty, that's a stretch.
It looks like the whiner is headed to jail for at least part of the 90-day term, and shouldn't expect a lot of sympathy from Rivers, who writes:
"Lindsay Lohan had "F**k You" painted on her nails. What people don't know is that the judge had 'Eat me you party skank' painted on hers."