Hip-hop pioneers Salt-N-Pepa performed their 1990s hits "Shoop," "Let's Talk About Sex," and "Push It," then joined En Vogue to perform their collaborative smash "Whatta Man" to close tonight's Billboard Music Awards. The special performance marked the 30th anniversary of Salt-N-Pepa becoming the first female rap artists to hit the top 40 on the Billboard Hot 100 with their iconic singleā¦