VIDEO : Hailee Steinfeld On Her Relationship With One Direction's Niall Horan

Hailee Steinfeld and Niall Horan are ?not trying to hide their relationship,? a source tells Us Weekly. The Edge of Seventeen star, 21, and the former One Director band member, 24, sparked relationship rumors back in January when they were spotted together at the West End production of Hamilton. One week later, Horan went to Steinfeld?s old brother Griffin?s birthday party. ?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 to realize that there are boundaries to a person?s life and personal life,? she told Us at the time.