demi lovato jennifer lopez
photo: Getty

Demi Lovato and Jennifer Lopez have a lot in common — way more than just being on Mariah Carey's "I don't know her" list. They have a deeper connection via Lovato's rumored new man, Brazilian MMA fighter Guilherme "Bomba" Vasconcelos.

Bomba and Lovato first met at the Unbreakable Performance Center in Los Angeles where they both train.

And this gym also linked Bomba to Lopez in a major way.

Turns out, Bomba trained J.Lo's on-and-off boy toy Casper Smart at the elite facility.

Smart training with Bomba makes perfect sense. Casper is a huge MMA fan, and even played a troubled fighter in the movie "Street."

Before the cheating scandal hit the net, MMA was what was rumored to be what drove J.Lo away — supposedly Smart skipped an event with her to catch a UFC fight.

Smart and Bomba are so tight, they give each other shout outs on social media.

"Congrats to my boy @bombatuf for the #WIN tonight #belator," Smart wrote after Bomba's win in June 2016 against his opponent Jordan Dowdy.

They even celebrate birthdays together — this squad is really tight.

Smart and Lopez hit up Bomba's birthday celebration in March 2016.

"Thanks for stopping by @beaucaspersmart @jlo #ysabel #birthday #LA #HOLLYWOOD #friends," Bomba wrote.

But the plot thickens — Smart is also friends with Lovato's ex Wilmer Valderrama!

And the two aren't just Hollywood acquaintances that give each other head nods at events...

They go to movies together.

"What's best after dinner? #DumbandDumber," Smart wrote under this photo of him, Valderrama, and another friend on Instagram.

I'm sure Casper's connection to Lovato's ex does won't affect his friendship with Bomba — but oh, what a tangled web Hollywood weaves!