Charlie's Porn Pal -- I Looked After Britney's Kids

Charlie Sheen's latest pornquaintance has a connection to pop princess Britney Spears -- as in she used to date Kevin Federline and even watched Britney's little munchkins ... TMZ has learned.

Turns out after Britney and Kevin split, Kacey Jordan and K-Fed dated briefly. We're told K-Jor spent a lot of time at K-Fed's house and would even babysit the kids from time to time when he would go out and do ... whatever it is he does.

Kacey tells TMZ, "I watched the kids when Kevin was dealing with the divorce. He was busy with going to so many meetings with lawyers. We went swimming ... they were great."

Babysitting a couple of young boys sounds much easier than looking after Charlie Sheen.

Charlie Sheen Wants to Create 'Porn Family'

Charlie Sheen wants to be the patriarch of a HUGE "porn family" -- composed of his favorite adult stars -- and he wants them all to live in a mansion down the street from his own house ... TMZ has learned.

Sources connected to Charlie tell us ... during the infancy stages of Sheen's most recent bender Tuesday night, the actor brought his realtor and some of his XXX lady friends to dinner with his neighbor George Santo Pietro -- Vanna White's ex-husband.

We're told the meal was served in the wine cellar at George's home -- located just two miles from Sheen's place -- and Charlie drank ... A LOT.

During the boozefest, Charlie agreed to rent out George's giant estate for four months -- at the rate of $250k per month -- while George goes away on an upcoming trip to Thailand.

And why does Sheen need an extra mansion? Charlie explained that he wants to start a "porn family" -- and he wants the "actresses" to all live in the same house. One big, smutty family.

The next morning, Sheen's people found out about the deal and were "furious" -- and immediately put a stop to the plans.

So, we gotta ask ...

Charlie Smoked Cocaine, Critiqued Porn Before 911

Charlie Sheen was smoking cocaine while he critiqued porn on his TV set for hours before the 911 call ... TMZ has learned.

Sources who were present at Charlie's house during his 36-hour party tell us ... after a man delivered a briefcase full of cocaine to the house early Wednesday morning, Charlie pulled out a small green pipe and started smoking cocaine continuously ... for hours.

There are many wild details, but we're told eventually Charlie ended up in his theater room with one of the porn stars with whom he was partying. They watched 3 hours of porn, as Charlie critiqued the action on the screen.

We're told Charlie, who fancies himself as a porn connoisseur, was questioning his companion about angles and body shots. We're told the porn star was "surprised" by the depth of Charlie's knowledge.

UPDATE: The 911 call was reportedly made by Sheen's neighbors -- "Real Housewives of Beverly Hills" stars Dr. Paul Nassif and wife Adrienne Maloof-Nassif ... after the couple received a call from someone in Charlie's house advising them of the situation.