Javi Marroquin and Briana DeJesus' relationship is heating up in a major way. While the couple had previously appeared to be dating casually and making time for one another every few weeks, they celebrated the fourth birthday of Marroquin's son, Lincoln Marshall, together this past weekend and days later, DeJesus proclaimed that she and Marroquin were a "family."

On Instagram this past weekend, both Javi Marroquin and his girlfriend, Briana DeJesus, shared images from the Power Rangers-themed celebration which included his son and her two daughters, six-year-old Nova and four-month-old Stella. Right away, fans began commenting to the couple and telling them how cute their blended family was.

Further confirming that their relationship is quite serious, Briana DeJesus shared an article [VIDEO] on Twitter with the headline, "We're a family now." The "Teen Mom 2" star also posted a heart-emoji with the article.

Javi Marroquin and his leading lady have become frequent flyers

After enjoying time in New York City with Briana DeJesus' sister, Brittany DeJesus, she and Javi Marroquin flew to Los Angeles where they spent time with one another while filming a number of MTV specials with their co-stars, including Marroquin's ex-wife, Kailyn Lowry. The couple has also traveled to Orlando, where they were recently spotted enjoying a romantic dance [VIDEO] on Instagram.

Javi Marroquin's ex-wife isn't happy about the relationship

As "Teen Mom 2" fans saw during Monday night's episode of the season eight reunion, DeJesus told host, Dr.

Drew Pinsky, that Lowry wasn't thrilled to see her dating her former husband. In fact, she said that because Lowry didn't want to get to know her, all of the other stars of the show, aside from Jenelle Evans, refused to be friendly to her during cast events.

Kailyn Lowry didn't address the relationship herself during the reunion special. Instead, she oddly proclaimed that she and Javi Marroquin have been talking about the possibility of getting back together. However, as he explained, the mother of his four-year-old has refused to stop talking to the many other men that she has allowed in her life in recent years.

To see more of Javi Marroquin, Briana DeJesus, Kailyn Lowry, their families, and their co-stars, including Jenelle Evans, Leah Messer, and Chelsea Houska, don't miss new episodes of the eighth season of "Teen Mom 2" on Monday nights on MTV at 9 PM.