"#WOD premiere. Such a great night. #proud @jlo," Rodriguez captioned a video on Instagram of the gathering.
Dewan posted a clip on her own account of herself and Lopez dancing.
"Worldwide trend what?! Waiting for #WorldofDance to start on the West Coast like..." she wrote.
"World of Dance" features solo and group performers as they compete for a grand prize of $1 million. Lopez, who started her career as a dancer, also executive produces the series.
"[The show is] the best thing I could have ever done," the star said at a press event in March. "It's like a dream come true and, like, the perfect job for me."
"I love dance at such at core level and I always consider myself a dancer first because I became a singer and an actress after. That was my first form of artistic expression. It's so part of who I am," she added.
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Lopez and Rodriguez were first linked in March, and confirmed their relationship the same month.
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