Credit: Ian Gavan/Getty Images

Baby's first red carpet!

Pregnant actress Linda Cardellini debuted her growing baby bump in London Wednesday, one day after she announced she and boyfriend Steven Rodriguez are due early next year.

Promoting her new film, Return, Cardellini, 36, flaunted her figure in a patterned floor-length design during the 55th BFI London Film Festival at the Vue West End.

Cardellini, who rose to fame portraying rebellious teen Lindsay Weir on the '90s cult TV hit Freaks and Geeks, also appeared on ER and in the Scooby Doo movies as Velma. Her most recent role was on CBS' Person of Interest, which debuted this fall.