Teen Mom 2 stars Briana DeJesus and Javi Marroquin celebrated his son Lincoln's fourth birthday together—and it could cause more trouble as his ex-wife and the boy's mother, Kailyn Lowry, has been feuding with DeJesus since her romance with Marroquin began!

On Saturday, DeJesus and Marroquin shared Instagram photos of Lincoln's Power Rangers-style birthday party.

DeJesus and her two daughters, Nova, 6, and Stella, four months, were visiting Marroquin from their Florida home and all were in the shots with little Lincoln. They were smiling and looking like a happy blended family.

DeJesus had Nova with ex-boyfriend Devoin Austin, and Stella with former bea Luis Hernandez. Like Marroquin, DeJesus also was giddy about their day celebrating his son (by Lowry)'s special day, writing as a photo caption, "Happy birthday, big boy."

In addition, DeJesus wrote on Twitter that she was "Helping Lincoln celebrate his birthday."

The love fest continued later on Saturday, as Marroquin and DeJesus went on a date to the Golden State Warriors basketball game. She boasted on Twitter, "Warriors game tonight with bae."

Marroquin has said he's dating DeJesus, confirming they had both "decided to make it official" after the Teen Mom 2 reunion taping in Los Angeles.

"We are dating. We've been friends for a while and we weren't in a rush," he told People.

As Breaking Celebrity News has reported, DeJesus and Lowry are locked in an explosive feud.

The drama began when DeJesus revealed on Twitter that she and Lowry "aren't friends" and "never were" when she got backlash for dating a co-star's ex-husband.