It was a big night for Jennifer Lopez — and Alex Rodriguez was her biggest fan.

Jennifer's new show World of Dance premiered, and of course, she watched the first episode with her boyfriend of nearly six months.

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"Big night," Alex, 41, can be heard saying in the clip Jennifer, 47, shared on Instagram. "Here we go," she exclaims before panning to the TV screen and showing off a big smile.

The former In Living Color dancer is a judge on the NBC reality dancing competition, which also stars Derek Hough and NE-YO as judges and Jenna Dewan-Tatum as host.

While it's obvious ARod is proud of the "Ain't Your Mama" singer, the feelings are definitely mutual. Last week, J.Lo gushed about the former Yankees star's daughters, Natasha and Ella, who have grown close to her own daughter Emme. "Me and my three favorite girls," wrote alongside a photo of her new girl gang.

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Before that, Jennifer made sure to let her 65 million followers know she loved watching baseball with the former slugger, making one of their first selfies together a photo of the pair's matching sneakers as they watched a game.

alex rodriguez jennifer lopez splash

And it's only going to get more serious for the couple. Earlier this month, Life & Style reported that Alex and Jennifer were ready to move in together.

"J.Lo asked Alex to live with her in her $28 million mansion in Bel Air, and he agreed,” an insider revealed. “The couple have barely spent a moment apart since they started dating and are ready to take things to the next level.”

The source continued, "As soon as the four kids met, it was like one big, happy family. J.Lo has always wanted to have a large family, so it’s a dream come true for her.”

For a look at some of J-Rod's cutest moments, check out the gallery below!