 "I Think We're Alone Now" proved to be Tiffany's biggest hit once she did record and release it.Her version of the song spent two weeks at number 1 on the "Billboard" Hot 100 chart (coincidentally, another Tommy James & the Shondells cover, Billy Idol's version of "Mony Mony", followed it on the top spot) and three weeks at number 1 on the UK Singles Chart.