12:18 PM PT -- TMZ spoke with a rep for the Evanston Police Department ... who tells us Kristin was initially stopped for speeding early this morning.
During the stop, the officer learned Kristin has been living in the state and driving without a valid IL license, which is against the law in IL.
Cops say Kristin was required to travel to the police station, in her own car, and was ultimately hit with a citation for $120 ... despite the fact that EVERYONE ON THE PLANET knows she splits her time between L.A. and Chicago because she's married to Bears QB Jay Cutler.
Cops say if Kristin wishes to continue driving in the state, she must get a valid IL driver's license.
Kristin Cavallari says she was taken into police custody in Illinois this morning -- and forced to post bail -- and claims it all has to do with her driver's license.
KC went to Twitter moments ago and said, "Who knew having a California driver's license in Illinois was a CRIME to be escorted to the police station to post bail?!! What a morning."
The former MTV star -- who's married to Chicago Bears QB Jay Cutler -- is insinuating that she had the same problem Justin Bieber had in L.A. ... when he was cited for not having a valid driver's license.
In Illinois, you are required to have an IL driver's license once you have lived in the state for 90 days ... or you can be cited.
However, KC says she's not a full-time IL resident and therefore shouldn't be subjected to that law. She also tweeted about it saying, "I still have an apartment in LA so I'm a resident of California."
Story developing ...
Cutler & Cavallari
If At First You Don't Succeed ...
6/12/2013 4:30 PM PDT BY TMZ STAFF
Kristin Cavallari & Jay Cutler
Pregnancy Was an ACCIDENT!!!
1/24/2012 5:50 AM PST BY TMZ STAFF
If you were surprised to hear Kristin Cavallari was pregnant with Jay Cutler's baby, you're not the only one -- the couple themselves were shocked by the news ... TMZ has learned.
Jay and Kristin announced yesterday they were with child -- following a crazy few months where they broke off their engagement, only to announce it was back on.
Sources close to the couple tell TMZ, K&Jay had discussed the possibility of kids -- but planned to start cranking 'em out in a few years ... not any time soon.
But shocking as it was, we're told they're thrilled with the news ... renewing their commitment more than ever to making their relationship work.
If Jay wasn't locked down before, he sure is now.
Kristin Cavallari & Jay Cutler
IT'S BACK ON!
Holding Hands in Public
10/4/2011 8:10 AM PDT BY Johnny Lopez
Less than three months after breaking off their engagement at the VERY last minute, Kristin Cavallari and Jay Cutler were seen holding hands in L.A. today.
Pretty shocking they would reconnect ... especially because Kristin had already taken pictures IN HER WEDDING GOWN when the two suddenly called it quits.
But the Chicago Bears quarterback was spotted in the audience at "Dancing with the Stars" last night ... and now, some P.D.A. in front of the photogs.
Breaking up really is hard to do.
NFL Star Jay Cutler
UNLOADS Colorado Mansion
8/6/2011 3:00 AM PDT BY TMZ STAFF
Jay Cutler has cut even more ties in Colorado -- the former Denver Broncos quarterback finally sold off the mansion he lived before he was traded to Chicago ... TMZ has learned.
According to official documents, Cutler purchased the home in Parker, CO in 2005 for $1.34 million. Cutler put his home up for sale in 2010 for $1.625 ... but nobody took the bait.
Cutler eventually lowered his asking price ... and the 5,344 square foot estate finally sold on July 19 for a cool $1,000,000.
Don't feel too bad for ol' Jay -- he's slated to rake in $15 million this season ... and of course, he doesn't have a wedding to pay for anymore.
Jay & Kristin
NFL QUARTERBACK HAS
7/27/2011 4:00 PM PDT BY TMZ STAFF
Jay Cutler and Kristin Cavallari -- IT'S OVER!
7/25/2011 4:40 AM PDT BY TMZ STAFF
Chicago Bears quarterback Jay Cutler will be about 110 pounds lighter when he enters training camp this year ... because he just dropped his fiancee, ex-MTV star Kristin Cavallari.
10 months after they began dating ... and just 3 months after they got engaged ... People.com is reporting the couple has split ... and suggest it was Jay who did the dumping.
Pretty shocking news considering they just hit Miami together earlier this month.
Don't be shocked if Kristin begins rooting for the Packers.
Kristin Cavallari -- Runway Walks Past BF Jay Cutler
7/15/2011 5:15 AM PDT BY Johnny Lopez
Kristin Cavallari and Jay Cutler
4/26/2011 10:45 AM PDT BY TMZ STAFF
Chicago Bears quarterback Jay Cutler finally came through in the clutch -- for once -- and popped the question to his MTV starlet GF Kristin Cavallari this weekend ... and apparently, she said yes.
According to People.com, 27-year-old Cutler proposed to the 24-year-old actress (?) during their weekend getaway to Cabo San Lucas.
The two have been dating since last fall.
Kristin Cavallari & Jay Cutler Get Schooled in Africa
4/14/2011 11:00 AM PDT BY Johnny Lopez
Jay Cutler -- WALKING Around Los Angeles!!!
1/27/2011 1:40 PM PST BY TMZ STAFF
Chicago Bears quarterback Jay Cutler mustered up enough toughness to stroll around an L.A. shopping center with his girlfriend Kristin Cavallari yesterday ... TOUGH!!!!!!
Even with his busted knee -- Cutler managed to keep up with Kristin for the entire duration of the shopping trip ... TOUGH!!!!!
Of course, our guy totally screwed up and didn't ask Jay about his injury ... or the rampant criticism of his dedication to the Bears ... or ANYTHING relevant.