ABC Family extended its Wednesday comedy block with success this week, as the premiere of reality skein “Beverly Hills Nannies” capped a winning night in the net’s core demos.

Nielsen estimates that the hourlong “Nannies” became ABC Family’s top-rated unscripted series preem to date in all core demos, averaging 455,000 women 18-34 and 1.15 million viewers overall in the 9 o’clock hour. In total viewers, it’s the cabler’s most popular reality show launch since “Venus & Serena: For Real” in 2005 (1.5 million).

The net also scored with second-year 8 p.m. comedy “Melissa & Joey,” which drew 1.21 million viewers, including 427,000 women 18-34 and 576,000 females 12-34. And at 8:30 p.m., rookie “Baby Daddy” built on its lead-in in all categories (1.44 million overall, including 487,000 femmes 12-34).

“Nannies” was the top-rated among the three ABC Family shows in women 18-49 (724,000), and “Daddy” was television’s No. 1 scripted original on the night in the females 12-34 category.

From 8 to 10 p.m., ABC Family’s Wednesday comedy block delivered huge gains vs. the year-ago time period, including a 140% surge among women 18-34 (398,000 vs. 166,000).