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Dominic Cooper Reveals He Was Dissed by Cher While Filming 'Mamma Mia': Watch

Scott Kowalchyk/CBS
Dominic Cooper on The Late Show with Stephen Colbert on July 18, 2018.

Ahead of the Mamma Mia: Here We Go Again release on Friday (July 20), Dominic Cooper was game to dish about his co-stars -- namely, Cher and Meryl Streep --  during an appearance last night (July 18) on The Late Show with Stephen Colbert.

Host Stephen Colbert cut to the chase, blatantly asking "which one is better?" and to which Cooper politely responded, "They are both phenomenal."

Looking to get some details about the A-list cast, Colbert inquired about working with Cher (someone he has never met). Cooper replied, "It must have been quite nerve-wrecking for her, as she entering a film as a family who knew each other very well."     

    

Cooper also says he received some playful shade from Cher, who found out while on set that Cooper had once dated costar Amanda Seyfried. 

Mamma Mia: Here We Go Again, featuring the star-studded cast, hits theaters July 20. Check out the clip of Cooper's appearance on Colbert below.