On the red carpet, the brunette babe wore a black fedora, which she paired with a brown dress, choker necklace and a silver necklace.
"#MetGala 2021 #JLoJenniferLopez @DSW @JLoBeauty @RalphLauren @HairByLorenzoMartin @elsahair @ScottBarnesCosmetics @RobZangardi @MarielHaenn @TomBachik," she captioned some more photos from the steps of the Met.
Of course, people couldn't get enough of Lopez's look. One person wrote, "SLAY!!!! 🔥," while another added, "I actually love! It’s so different and I love when you take risks like this! 👏🏽."
The "On the Floor" songstress wasn't the only one who donned the look — Pharrell Williams, Lupita N'yongo, Shawn Mendes, Kacey Musgraves and more were also inspired by the wild west.
Even though Lopez didn't walk the carpet with her boyfriend, Ben Affleck, the two still posed together — and even smooched with their masks on!
The two — who were engaged in 2004 — got back together earlier this year after Lopez split from Alex Rodriguez.
The Hollywood stars are getting serious, and an insider previously spilled to OK! that the father-of-three will pop the question "before the end of the year. It isn’t a question of if they will get married but rather when."
"This time, Ben isn’t going to let Jen get away. Let’s be honest, the new relationship might technically only be a few weeks old, but in reality they are picking up where they left off," a source shared earlier this year. "Jen and Ben both know everything about each other — the good, the bad and the ugly. They are not starting at square one."