'Teen Mom' Star Kailyn Lowry is Engaged! All the Secret Proposal Details!

Fun-loving Kailyn Lowry was amused when her boyfriend of one year, Jose “Javi” Marroquin sent her on a scavenger hunt on Sept. 1.

OK! GALLERY: ULTIMATE TEEN MOM GALLERY: MACI BOOKOUT, LEAH MESSER AND MORE!

Her happy smile, however, turned to tears of joy when the trail led back to a favorite place from her childhood and Javi got down on one knee and proposed. After years of heart-break and troubled relationships with other guys, Kailyn, 20, said yes to a forever with Javi!

“The scavenger hunt brought Kailyn back to her hometown beside Lake Wallenpaupack, Pa., where she went as a child,” explains an insider. “Javi had her son, Isaac, there with a little tux and flowers, then he got down on one knee.”

OK! GALLERY: THE CASTS OF TEEN MOM AND TEEN MOM 2 REUNITE IN NYC

This, all about one year after Javi first spotted the Teen Mom star from Hawley, Pa., at her retail job and hung around until she agreed to give him a chance. “He wouldn’t give up until she went out with him. But at first she thought he was really young, like 15, and crazy to be asking her out,” says the insider. “But he’s 19.”