The 32-year-old actress, who won for best original song for "Shallow" and is nominated for best actress in a motion picture, drama for her performance in "A Star Is Born," paid tribute to Garland, who starred in the 1954 version of the film.
The dramatic gown mirrored the one Garland wore while playing Vicki Lester in the older version of the film. Gaga also dyed her hair to match the beautiful couture gown.
Many of the star's fans noted the similarities on social media.
Gaga is known to wear outlandish styles during award shows, so the classic choice surprised some. She accessorized with an exquisite diamond necklace from Tiffany & Co.
The remake of the film, starring Gaga and Bradley Cooper, marked the iconic singer's first time in a leading role on the big screen. The film centers on the love story of two musicians and how substance abuse issues challenge their relationship.
While accepting the award for best original song for "Shallow" in "A Star is Born," Gaga spoke about how difficult it can be to be a female in the music industry.
“I just have to say, as a woman in music, it is really hard to be taken seriously as a musician and a songwriter," she said during the speech.
"These three incredible men… they lifted me up and supported me,” Gaga added, mentioning the song's co-creators, musician Mark Ronson, Anthony Rossomando and Andrew Wyatt.
She is already a Golden Globe winner, though. Gaga received an award for best performance by an actress in a limited series or motion picture made for television for her performance in “American Horror Story: Hotel” in 2016.