View gallery Image Credit: Getty Images Billie Eilish and Nat Wolff kept fans guessing for months before finally stepping out publicly as a couple. From friendly meet-ups and tour appearances to romantic getaways and, finally, some red carpet moments, their relationship slowly unfolded in front of our eyes. Below, Hollywood Life has the detailed timeline of Nat and Billie's romance. 2023 Billie first crossed paths with Nat's younger brother, Alex Wolff, in 2023 before eventually getting acquainted with Nat.