It seems Brad edged out Rob in the top actor category in USA Today's Celebrity Heat Index for the month of April:
Top actor: Brad Pitt
Both leading men are working in Europe: Pattinson with movie Bel Ami and Pitt with family.
This week Rob was number 21.. along with Kristen Stewart. Educated pop culture guess tells me with Eclipse promotion starting up, these two won't be in the double digits for that much longer!