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Sam Taylor-Wood, Aaron Johnson

John Stillwell - WPA Pool/Getty Images

It's a girl for Kick-Ass star Aaron Taylor-Johnson and fiancée Sam Taylor-Wood! The little bundle of joy was born Jan. 18 in London.

So what did Johnson, 21, and Taylor-Wood, 44, name their newest addition?

Romy Hero! She's the second daughter for this May-December couple, who are parents to 18-month-old Wylda Rae. The newborn also joins big sisters Jessie, 5, and Angelica, 14, who are Taylor-Wood's daughters with ex-husband Jay Jopling.

Johnson and Sam Taylor-Wood met in 2009 on the set of the actress' directorial debut, Nowhere Boy.

A rep for the couple tells E! News that "both mother and daughter are doing well." Congratulations!