Does anybody really want Joe Jonas to grow up? Twenty-two years old and newly sprung from the Jonas Brothers, too old to credibly position himself as a chaste boy-bander, he’s hemmed in nevertheless by his tween-leaning fanbase.

“Fastlife” works best when it stays mild (like “I’m Sorry,” which sounds like a great lost Backstreet Boys ballad). Edgier fare like the Pitbull-esque “Love Slayer” doesn’t always convince, though a riotous, Lil Wayne-featured remix of “Just in Love” is the best thing here. Eighteen months ago the pairing would have been unthinkable, but these days Weezy is unbearably mild and Jonas is (sort of) wild and somehow, it seems just right.