[www.tmz.com]- Kim Kardashian is all hot and bothered by a new porno about to hit the market — but not in the good way.

Sources tell TMZ the entire Kardashian family is “taking legal action” against Hustler Entertainment after learning about the XXX spoof of their reality show which the smut peeps creatively titled, “Keeping it Up For the KardASSians.”

We’re also told the people at E! Entertainment are also considering their legal options — it might be because the signature “whistly theme song” in the porno sounds awfully similar to the one in the show.

FYI — Kim also took legal action when the porno that she actually starred in came out back in 2007 — but nothing ever came of that … so to speak.