I love pop-star concerts -- the elaborate setups, the complicated dance maneuvers, the clothes that leave little to the imagination, the sex appeal that surrounds the teen idols, and the simple fact that I get to be a teenager again. Not that I'm old or anything, but sometimes I just want to escape 21-year-old problems and go back to the days when the biggest drama in my life was another girl wearing the same shirt as me at school.

So when one of my best friends, Jessica, from home called me up, screaming that she'd won two tickets off the radio to the Justin Timberlake and Christina Aguilera concert in Milwaukee, WI, I joined in her shrieking. I was excited to relive the early days of high school, when my four best friends and I would travel around the state of Wisconsin just to see NSYNC perform their pelvic-thrusting moves. And best of all, this concert would be free. The anticipation left me giddy.

The day of the concert, though, I was actually pretty calm. After raiding Jessica's wardrobe, I found what I thought to be a suitable concert-going outfit -- Holister cords, a three-quarter length shirt and flip flops -- and we were on our way. Jessica, looking slightly more like Britney Spears, assured me that what I was wearing was fine, that I looked "comfortable."

As soon as we walked up to the Bradley Center, where the concert was being held, I saw hundreds of teens and preteens in their stiletto heels, short shirts and air-brushed tank tops that said "Justin, rock MY body." So much for the carefully picked outfit -- I should have just not put clothes on; I would have blended in much better.

Though Jessica and I were both excited to relive our teenage years for a night, we thought we'd be better fit to play the role after a quick visit to Stub's Pub. It's amazing how a few shots can un-do two years of 20-something maturity in a matter of minutes. By the time we took our seats next to the gaggle of thirteen-year-olds, and the lights dimmed, we were ready to start screaming with the best of them.

Christina was up first, and while she didn't repeat her VMA Awards girl-on-girl lust kiss, her half of the Justified/Stripped concert was H-O-T-T (yeah, hot enough for two t's.)

The diva stepped onto stage in a slightly more modest version of her "Dirrty" video's wardrobe. Emphasis on the slightly. The ass-less chaps and tight black leather were still sported, but her booty was a little more covered by her daisy dude shorts.

I have to admit, despite my years of loyalty to NSYNC, I was more excited for Christina's concert than I for Justin's. Her voice is so powerful on her CD, and I wanted to see if she was really that good in real life. I wasn't disappointed.

Her first two songs were my all-time favorite ass-shaking songs: "Dirrty" and "Get Mine, Get Yours." There's just something seductive, and well, dirty, about those tracks that remind me of sneaking out to high school parties and grinding in a corner with the hottie-of-the-week. Oh wait -- I never did that. But if those songs had been around then, I totally would have.

Our pre-teen friends sitting around us started their own ass-shaking convulsions, so Jessica and I quickly joined in. Soon our whole section could have been Christina's dancers the way we were shakin' it.

While the first few songs were more about choreography, the rest of her hour-and-a-half long concert was all about Xtina's vocal chords.

"Damn. Goosebumps," my friend Jessica said as Christina belted out "The Voice Within." I had them too.

And she remained strong for the entire hour and a half she was on stage. Take notes, Britney. This girl sings at her concerts.

She paid tribute to her pop-princess beginnings with Come On Over, Lady Marmalade, and What A Girl Wants. And she kept her promise that the girls wouldn't be the only ones stripping down to barely nothing -- during "Walk Away," one of her hot male dancers took most of it off in a way that should have made mothers cover their pre-teen daughters' eyes.

The highlight of her show, though, was when Christina paid tribute to one of her favorite blues artists, Etta James. I'm not usually a fan of re-makes of classics, but Christina's version of "At Last" definitely did the song and the artist justice.

Christina ended her half of the concert in jeans and a tee-shirt-and sang the beginning of "Beautiful" acapella. I was amazed that her voice was as strong as it was in the beginning of the concert.

While Xtina's concert was focused around her songs and her voice, Justin's was definitely all about the show-special effects, fire works, and dramatic lighting. And he was all about the teasing.

He looks good, and he knows it.

Justin's dancers came out one at a time to "Rock Your Body," faces covered, so no one knew which one he was. Anticipation grew as the dancing grew more and more heated. And then he revealed himself. Every single girl in the Center gasped and then screamed at the very same moment.

NSYNC has taught him well. The boy can sing and dance -- at the same time. Being an experienced NSYNC concert-goer, Justin's show reminded me of his boy band days. Only without the boy band. He disappearing act into the stage floor and his crane-type contraption that sent him out over his floor-seated audience brought me back to the days of NSYNC's HBO special.

While he was out on the "crane," he spent about 10 minutes just beat-boxing. Holy hell, that's hot. He could have done that for the whole concert, and I would have been perfectly happy.

But his best performance of the night came when he sang "Cry Me a River." There's just something about the bitter breakup song and Justin sulking around the stage, looking for revenge that sent electricity throughout the Center.

"That BITCH!" We all thought. Then proceeded to wonder how anyone could drive Justin Timberlake to write a song like this-certainly none of the hundreds of girls there that night.

Saving the best for last, Justin ended his concert and my fantasies with "Like I Love You" (my other ass-shakin' song). And then he was gone. The lights blinded us all, forcing us to wake up and go back out into the real world. Without Justin.

I love pop concerts. I love feeling like a pre-teen again for a night, and at the same time knowing that I only have to feel like one for a night. I leave feeling rejuvenated and sexy-ready to conquer the world with my booty-tight pants and sex-goddess attitude.