Lohan, 28, posted a selfie with the 44-year-old writer-actress on her Instagram account.
"Lovely running into an inspiring, funny, beautiful old friend!" she captioned the picture.
The meeting comes days after their fellow co-stars Amy Poehler, Lizzy Caplan and Daniel Franzese had their own mini-reunion at Los Angeles hotspot Chateau Marmont, where Caplan was celebrating her Emmy nomination for 'Masters of Sex'.