leann230logo.jpgLeAnn Rimes is blasting online reports that she's pregnant with fiance Eddie Cibrian's baby.

The 28-year-old country cutie tweeted:

    "this is such BS!!!! Lol, you people all report BS."

This past Monday, Rimes confirmed that she and Cibrian, 38, are finally going to be heading down the aisle. To make it clear that she's not expecting, LeAnn also tweeted about her vacation plans to Cabo San Lucas, Mexico.

    "Cabo!!!!! Sun, bikinis, friends, food, tequila...celebration!!!! Gonna be the best trip!!"

Cibrian gave Rimes a 5-carat oval diamond engagement ring. Let's hope she doesn't lose the big gem in the gorgeous waters of Cabo!