The 30-year-old actress plays a woman who finds love with a younger man (Blackley) while on vacation with her husband (Iddo Goldberg) in Italy.
The film, directed by Kat Coiro, premiered last year at the Tribeca Film Festival and was presented in black and white, but when it is released this month, it will be seen in color.
And While We Were Here will be released on iTunes and VOD on August 13 and in theaters on September 13.
Pictured inside: Kate running errands in a multi-colored dress on Wednesday (August 7) in Los Angeles.
“And While We Were Here” Trailer