The couple, who were the latest to perform together when Lopez co-starred in the 2020 Pepsi Super Bowl LIV half-time show, took to the stage recently at the LA Dodgers Blue Diamond Gala.
Lopez introduced Emme using the gender-neutral pronouns they and them.
“The last time we performed together was in a big stadium like this,” Lopez said in a video of the moment shared by TikTok user @christinathesupermom. “And I ask them to sing with me all the time and they won’t.”
“So this is a very special occasion. They are very, very busy. Reserved. And expensive,” Lopez continued. “They cost me when they go out. But they’re worth every penny because they’re my all-time favorite duet partner.”
Emme then appeared on stage wearing a rainbow microphone to sing Christina Perri’s hit “A Thousand Years”.
Lopez shares Emme and twin brother Max with her ex-husband, singer and actor Marc Anthony.
CNN has contacted Lopez to comment.