Celebrities have truly been coming through with their Halloween costumes, but the year's most popular trend? Celebs dressing up as other celebs. The latest example being Emily Ratajkowski, who recreated Jennifer Lopez's viral 2000 Grammys moment. You know, when she wore a plunging green Versace dress on the red carpet. Here's the original look:

And here's EmRata:

Other celebs who dressed up as celebs this year? First, we have Kendall Jenner and Hailey Bieber, who did a whole Simple Life-themed shoot of themselves recreating one of Paris Hilton and Nicole Richie's most iconic scenes:

And Troye Sivan was Addison Rae during her Britney Spears Memoir Pap Walk™:

To name! A few!

Reminder that this green dress was literally the reason Google Images was created, and J.Lo's stylist initially didn't want her to wear it. As she told Vogue, "It was a dress that other people had worn already. My stylist was like, 'Please don't wear it. Somebody else has worn it.' I was like, 'Well, you bought it, and it looks the best, so I'm going to wear it.' And so I did. And it caused quite a stir."

She added, "I guess every generation needs its iconic kind of Marilyn dress, and this is that dress for this generation. Why it became that? It was just a moment when the wind blew open, and I walked out onto the stage, and it just kinda happened."