Shayne Lamas -- 'Dirty' Deed Made Me Preggo ... Again

Shayne Lamas -- who decided to marry her hubby HOURS after meeting him at a drunken pool party -- is re-writing all the rules of marriage ... 'cause not only is she still with the dude ... they're still HAVING SEX.

We know that ... because sources close to Shayne tell us she's pregnant again.

We told you their story ... Shayne is a former winner of "The Bachelor" who fell in love with TheDirty.com founder Nik Richie 4 years ago at a wild Vegas pool party ... and hours later decided to get hitched.

NO ONE expected it to last. But Shayne and Nik are still going strong ... they have a 2-year-old daughter named Press -- and now we're told Shayne's 16 weeks pregnant with their 2nd baby.