Internet reports suggested The Piano star was pregnant by Moyer, just weeks after the pair got engaged.
They started after they shot the pilot for the U.S. vampire show in the summer of 2007.
But despite their pair's wedding plans - they insist they are not ready for new additions just yet.
A rep for the star insists, "She's not pregnant.
Moyer has two children from previous relationships - son, Billy, born in 2000, and a daughter, Lilac, born in 2002.