A lot goes into choosing the perfect look for a red carpet as important as the Oscars. It's Hollywood's biggest night of the year, after all. Over the years, we've seen our fair share of absolutely stunning Oscars gowns, from Jennifer Lawrence's Dior princess gown in 2013 to Zoe Saldana's purple Givenchy number in 2013. We've truly seen a bit of everything from the big screen's leading ladies - including some who have shown up in gowns that, while stunning, reminded us a whole lot of a gown that another actress wore already. Take a spin through the gallery to see the few times this happened, and then take a peek at what we think the actresses will show up in this year.