Last month, Hailee and Niall spent time together in Las Vegas, attending a Backstreet Boys concert and hanging out at XS Nightclub.
The two sparked dating rumors in January after they were spotted at a West End production of “Hamilton” in London.
Steinfeld recently played coy about the dating rumors, telling Us Weekly, “I feel so lucky that [my fans] care enough about me to know what I'm doing every second of every day, but I think that sometimes it's hard for people, in general, to realize that there are boundaries to a person's life and personal life. I am a very private person. I do love that I have the opportunity to share with them what I'm comfortable with and they're there to listen and support me.”