Lindsay Lohan -- Partying 'til 5 AM with Court Date Looming

With a court date in New York fast approaching, Lindsay Lohan let off a little steam last night/this morning by partying in London with a few friends until 5:00 AM.

LiLo has been ordered to appear in a NYC court on Monday ... a result of her run-in with a psychic in a New York club back in November.

Lohan will be there to answer a desk appearance ticket, so a number of things could happen -- a future court date could be set, she could enter a plea ... those are just a few of the options.

If she doesn't show, a warrant will be issued for her arrest.