Resigned to do the time, Paris Hilton played jailhouse hostess yesterday, accepting her first guests since her stunning reversal of fortune landed her back in lockup.

The hotel heiress’ sister, Nicky, and her ex-boyfriend Stavros Niachros spent less than an hour with the mentally fragile inmate, trying to boost her spirits.

“She’s being strong,” Nicky Hilton told reporters as she emerged from the Twin Towers Correctional Facility’s medical center just after 1 p.m.

The pampered princess is apparently adjusting to her new isolated ...