Steinfeld, who is also a pop singer, is shown wearing a hot pink bikini and a pair of Privé Revaux designer sunglasses.
"Merry Christmas Eve My Loves!" Steinfeld captioned the post, adding a flower, fish, palm tree and tropical drink emoji.
Steinfeld has easily kick back and enjoy some tropical rays after her successful 2017.
She reprised her role as Emily Junk in Pitch Perfect 3 and released two songs that made some waves in the music world, "Most Girls" and "Let Me Go."