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Javi, 24, was spotted hanging out with Briana's sister Brittany DeJesus in Los Angeles.
The father of Lincoln, 3, with Kailyn posted a video waking Brittany up in her hotel room.
The duo then hit a Los Angeles club, where they were caught on camera getting boozy together.
Are the new co-stars dating? Javi exclusively revealed to RadarOnline.com their relationship status!
"Absolutely not," Javi told Radar of if they're dating. "We had some business in LA together."
As Radar readers know, Briana is joining the Teen Mom 2 cast despite disapproval from co-stars Kailyn, Leah Messer, Jenelle Evans and Chelsea Houska. "Some of the girls are unreliable with filming and others just are no longer bringing the drama viewers want to see," a source told Radar. "They needed to spice it up."
Marroquin ended his two-week relationship with Channing Walls earlier this month. His ex-wife Lowry is expecting her third child with her mystery baby daddy this summer.
Are you surprised Javi and Brittany are just friends? Tell us in the comments!
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