Gary Shirley's Marriage License Revealed Following Secret Ceremony

Teen Mom OG star Gary Shirley and his baby mama #2, Kristina Anderson, have made it official— and RadarOnline.com has the proof!

According to a Madison County Certified Marriage License exclusively obtained by RadarOnline.com, Amber Portwood's ex-fiance said "I do" to his girlfriend of nearly three years on Monday, September 28, in their hometown of Anderson, Indiana.

Madison County Circuit Court Judge Thomas Newman Jr. officiated the ceremony, which seems to have taken place in the local courthouse.

The couple listed their 6-month-old daughter Emilee as a dependent child, in addition to Shirley's daughter with Portwood, Leah, 6, and Anderson's daughter from her previous marriage, Karly, 8.

The 28-year-old father of two still has primary custody of Leah, while his new wife's ex-husband, Greg, has primary custody of Karly following the former pair's nasty 2014 divorce. (As RadarOnline.com reported, Anderson, 28, began dating Shirley while she was still married.)

Sources tell RadarOnline.com that the couple further celebrated their union in their favorite Michigan vacation spot.

Friends were shocked that the outspoken Shirley was able to keep the hush-hush nuptials a secret for more than a month.

"Gary is a total loud mouth and tells everyone about his business," a source says.

Portwood, 24, and her fiancé Matt Baier, 43, found out about the wedding through rumors around town, insiders tell RadarOnline.com.