In the wake of the potential major break in the Caylee Anthony investigation, Headline News' Nancy Grace saw huge numbers at 8pmET, according to overnight household ratings obtained by TVNewser.

At 8pmET, FNC's The O'Reilly Factor had a 2.3 overnight rating, HLN's Grace had a 1.6, MSNBC's Countdown had a 1.3 and CNN's Campbell Brown had a .8.

The overnight numbers are based on 52 metered markets. The actual ratings will be released sometime around 4pmET today.