Jonas Brothers Prepare for Tour 2013 Kickoff in Chicago, Fans Teased About Upcoming Shows, New Album 2013 on Twitter [PHOTOS] [VIDEO]

Two days before the start of the Jonas Brothers Live Tour 2013, the trio are in Chicago preparing for the 30-show trek.

The "Pom Poms" band has been teasing fans about the start of the show via social media all week. Today (July 8), the official Jonas Brothers Twitter account teased a picture of rehearsals. The black-and-white photograph shows Nick, Joe and Kevin Jonas as well as their backing band sitting on an expansive wooden stage and playing instruments. The "brief look into rehearsals" is, in fact, small, but seems to indicate a mature setting and full live sound.

The boys are in Chicago, according to their Twitters. "Just saw the venue in Chicago... Really pumped for Wednesday night! Who's coming," Nick wrote yesterday (July 7).

Joe confirmed the band was, in fact, at the First Merit Band Pavilion in a Vine post yesterday. "You guys have any idea where we can do a show?" he asks his brothers in the short video. Kevin doesn't, Nick does.

Of course, it's not all work and no play for the JoBros. Kevin Instagrammed a photo of "tour essentials" that he just had to pack.

If venue teases aren't enough to get fans excited, Nick Jonas teased something else. "I'm really looking forward to playing some more of the new music this summer on tour!" he tweeted on July 6.

Fans are already familiar with three tracks off the Jonas Brothers' untitled new album 2013. "Pom Poms," "First Time" and "Neon" have all already had live debuts. Songs with the titles of "Sandbox" and "The World" were also revealed during a fan chat last month.

The Jonas Brothers Live Tour 2013 begins July 10 in Chicago and will go through Aug. 16 in Los Angeles, California. Karmin is set to open. Tickets are on sale now.