Here's an X-Files mystery we need solved: How did we not know that Gillian Anderson's daughter was a) 20 years old and b) absolutely stunning? Piper Maru Klotz joined her actress mother on the red carpet at last night's Olivier Awards in London. Anderson, 46, was nominated for her role as Blanche DuBois in the Old Vic's production of A Streetcar Named Desire. To celebrate the big night, The Fall star brought daughter Piper as her date, prompting countless "who's that girl" comments. Mother and daughter share the same penetrating blue eyes and enviable cheekbones. They also apparently share the same taste in fashion, wearing nearly identical black strapless gowns, with Piper's platinum locks, pierced nose, and tattoo providing a nice counterpoint to her mom's more classic style.

Piper is Anderson's oldest child — she has two young sons from another relationship

— and has an impressive X-Files pedigree. She was born in September 1994 to Anderson and her first husband, Clyde Klotz, who was the famed show's assistant art director. Get this: Series creator Chris Carter even named an episode of the show for her in 1996, season 3's "Piper Maru." We couldn't be more jealous if we tried.

Time to get Scully Jr. on your radar. Can they get her a cameo in the reboot