Credit: Dave M. Benett/Getty Images

And then a hero came along!

Kick-Ass' Aaron Johnson and fiancee Sam Taylor-Wood are the proud parents of a brand-new baby girl, Romy Hero Johnson.

The artist, 44, gave birth to her daughter "at home in London on January 18," a rep for Johnson, 21, told "Both mother and daughter are well."

The engaged couple -- they met on the set of the 2009 film Nowhere Boy, which she directed -- are already parents to daughter Wylda Rae, 18 months.

Taylor-Wood and ex-husband Jay Jopling share daughters Jessie, 5, and Angelica, 14.