Double Up is R. Kelly's 13th album (not counting the unreleased Loveland) and easily his most interesting. Perhaps not his best, but definitely his most interesting.

Double Up comes at an interesting point in Kelly's life and career. Five years ago this month, Kelly was indicted in Chicago on 21 counts of having sex with a minor. Those charges would later be reduced to soliciting a minor for child pornography, seven counts of videotaping the acts, and seven counts of producing child pornography. Kelly still faces 14 of the charges. Five years, three albums, two world-tours and uncounted award show appearances later Kelly has yet to answer those charges in a court of law.

Or on wax.

This is part of what makes Double Up so interesting. Of course, entertainers have faced legal trouble before. In Hip Hop, the norm is for the accused to lay low for a minute, then emerge triumphantly with a "Not Guilty" song or interview that rallies the fans. With the exception of Jay-Z's "Guilty Until Proven Innocent" (2000) Kelly has done neither; he's showed no signs of slowing down or of being even vaguely aware of the charges that stand against him. In fact, Kelly actually has a song about being incarcerated. "Best Friend" is a classic R. Kelly ballad with Keyshia Cole (think: Sparkle) and Polow Da Don playing out a twisted tale of loyalty and suspicion.

Except for (maybe) the Swizz Beatz-laced intro "The Champ," Kelly doesn't make the slightest reference to his real life drama. Instead, he capitalizes on the hyper-sexual persona that he's developed over the years. For the most part, the innovator who brought us "Bump-n-Grind," "Feelin on Yo Booty" and "Sex Weed" sticks to the script.

Conceptually, Double Up has some question marks. The catchy title track featuring Snoop Dogg clears up the meaning of "doubling up", but lacks any real party feel. "Sex Planet" is just plain wack... sounds like a corny parody of a slow jam: "Girl I promise this'll be painless/we'll take a trip to Uranus..." "The Zoo" is an unfortunate metaphor comparing love-making to all sorts of exotic wildlife.. "I got you so wet, it's like a rainforest...like Jurassic Park except I'm your sex-a-saurus. " Songs like this make it hard to argue that R hasn't completely lost his mind. Oh, and "Sweet Tooth" and "Rollin Up" are pure filler. "Real Talk" is real comedy and "Leave Your Name" is even funnier.

The bright side is that Kelly does a great job of leveraging his industry clout to generate some pretty decent guest appearances. "Trying to Get a Number" is basically a singing contest between Kells and Nelly, "Get Dirty" has Chamillionaire getting - rather than riding - dirty. Ludacris and Kid Rock help Kells capitalize on Hip Hop's current infatuation with...well rock stars, on "Rock Star." Plus, there are appearances by T.I., T-Pain, and Usher. Counting the Keyshia Cole, Swizz and Snoop cameos already mentioned brings the number of platinum artists on this album to 11.

So, not only does Kelly serve up T.I. and Luda on the same disc...not only does he feature his own closest competition in Usher and T-Pain... but he does it all while openly flaunting his addictions to wild nightlife, alcohol and drugs. And to top it off, he tosses in "Rise Up" as a tribute to the members of the Virginia Tech community in the wake of the recent massacre.

Without question, Double Up's real mark is made by the universally appealing "I'm A Flirt (remix)" featuring T.I. and T-Pain and the equally radio-friendly "Same Girl" featuring Usher.

So, where does this one rank among the R. Kelly albums before it? It's better than The Best of Both Worlds and R. but clearly lacks the vision and cohesion of a 12 Play or even TP-2.com. A true R. Kelly fan (you know who you are) once told me that only true R. Kelly fans can really feel his musical genius. Double Up is probably case-in-point. Long time fans are sure to love it; others perhaps not so much.

At least he seems to have given up his Pied-Piper thing.