Aubrey Plaza and Christopher Abbott have become first-time parents. The couple reportedly welcomed a baby daughter in late July, according to reports. TMZ posted photos of the actress carrying a baby in New York after seeing Death of a Salesman on Sunday, which marked Abbott’s last performance. Abbott played Biff Loman in the Broadway revival of Arthur Miller’s classic play opposite Nathan Lane and Laurie Metcalf; he earned his first Tony Award nomination for the role, and they attended the ceremony as a couple (see photo above). Plaza, meanwhile, earned an Emmy nom for best supporting actress in a drama series for her role in The White…