RCA/JIVE HEATS UP: Outgoing head Barry Weiss, who is now ensconsed as head of Island Def Jam and the Universal Motown Republic Group, certainly didn’t leave an empty cupboard. Tomorrow, Jive/ZLG’s Chris Brown and J/RMG’s Jennifer Hudson hit the streets, both expected to debut in the 200k area, with RCA/RMG’s The Strokes also on tap. Then, a week from tomorrow (3/29), Britney Spears’ latest Jive/ZLG album, Femme Fatale, comes out, which is expected to top the chart the following Tuesday. Maybe Barry left a couple of weeks too soon. (3/21p)