Jay Cutler & Kristin Cavallari

Proof Jay Cutler actually went through with it -- Kristin Cavallari just posted this happy wedding photo with her new hubby ... nearly TWO YEARS after he torpedoed their first engagement by dumping her ass.

At least this wedding dress turned out better than the last ones ...

Second time's a charm.

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.

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.

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.

Why would Jay Cutler and Kristin Cavallari break off their engagement right after her WEDDING DRESS photoshoot? We came up with 4 awesome theories ... kinda ... sorta.

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.

You'd be uninterested too if you usually got to see Kristin without the bikini.

According to People.com, 27-year-old Cutler proposed to the 24-year-old actress (?) during their weekend getaway to Cabo San Lucas.

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.