In a serious blast from the past, Lindsay Lohan reunited with Paris and Nicky Hilton this weekend at a party for a friend— Allison Melnick, the one pictured in blue above— in West Hollywood.

Paris and Lindsay have had a tenuous friendship over the years, as they've grown from wild party pals on the scene in the mid-aughts to enemies to friends again.

Two weeks ago, they reportedly partied so hard together in Hollywood that the cops had to come break it up.

It's nice to know that all the celebs from 2006 are still alive and feeling cheeky. The only person missing is Britney.

[TMZ]