Premature cougar Lindsay Lohan has moved on from a younger man to an even younger one. After dating 19-year-old model Liam Dean, sources say the 27-year-old actress is cozying up to Liam Neeson’s 18-year-old son, Michael.

The two were spotted Friday partying at hot spot Finale, where spies tell us they snuck off to the women’s bathroom together at one point.

Page Six reported in October that Lohan was seeing Dean, a hunk signed with Red Model Management, after the two were spotted partying at 1Oak. She was also linked to teenage Ralph Lauren model Morgan O’Connor.

Now, the troubled actress, who completed rehab this summer, has moved on to Michael, son of late actress Natasha Richardson and Neeson and grandson of Vanessa Redgrave.

A source said: “Lindsay seems to have this thing for younger men at the moment.

“They were together at a house party of one of Lindsay’s stylist friends before Thanksgiving, and were together at Finale on Friday. Lindsay was seen leading him into the women’s bathroom, hand-in-hand. The odd thing was that Dean was with them all night, even though Lindsay had been seeing him, too.”

But a rep for Neeson insisted “it’s not true” that Lohan and the actor’s son are romantically linked. Lohan’s rep told us, “Lindsay is friends with Michael but they are not dating.”

Liam Neeson recently told the Belfast Telegraph he doesn’t want his kids to get caught up in the acting business. “You go for an interview for a part and you’re rejected for all sorts of things — you’re too tall, or too Irish,” the “Taken” star said. “It is a hard process to go through and I don’t want my kids to have to feel that.”

Meanwhile, sources say Lohan’s heading to Miami this week for Art Basel, where she’s being pegged as this year’s Demi Moore — as in the star who shows up to ubiquitously party.

But we’re told it’s highly unlikely Michael’s family would allow him to go to Miami to hang with her.