It’s JT take two: Like Justin Timberlake before him, Jesse McCartney, 21, is a former child star (he was a regular on Summerland) who’s ready to prove he’s all man — and an R&B–flavored hitmaker. His third studio CD bursts with fiery hooks, from the hot single “Leavin’” and the seductive “How Do You Sleep?” to the mature “Told You So.” It’s a dazzling step in a new direction. (Hollywood)