Go-Go’s lead singer Belinda Carlisle will bare all for Playboy’s August issue, the 42-year-old revealed Wednesday on ABC’s “Good Morning America.” “It’s sort of an homage to the sort of Vargas style, ’50s pinup,” Carlisle said of the spread. Explaining her action, she stressed, “You don’t have to be age 20 and size zero to be . . . sexually viable or viable as a woman. And that’s part of the point that I would like or we all like to prove, anyway.” Meanwhile, on Tuesday, the Go-Go’s released their first album of all new material in 17 years, “God Bless the Go-Go’s.”