Pretend to be married...

Katherine Heigl (ex-Izzy Stevens, "Grey's Anatomy," "One For The Money," "27 Dresses") joined an all-star cast for "The Big Wedding" due out this fall. Her co-stars in the comedy film include Robert De Niro ("Meet The Parents," "Cape Fear," "Raging Bull"), Diane Keaton ("Something's Gotta Give," "The First Wives Club"), Susan Sarandon ("Wall Street: Money Never Sleeps," "Thelma & Louise"), Robin Williams ("Good Will Hunting," "Mrs. Doubtfire," "Good Morning Vietnam"), Amanda Seyfried ("Dear John"), and Topher Grace ("That 70's Show"). Check out the video sneak peek below.

Watch the Grey’s Anatomy Season 9 spoiler video.

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- Candace Young