ET caught up with the actress at Comic Con, where she also dished on her 'Big Little Lies' co-star, Meryl Streep and her upcoming role in 'Boy Erased.'

While walking the red carpet at the London premiere of her new film, Mamma Mia! Here We Go Again, the legendary actress spoke with ET about how much fun she's having on set of the HBO show.

ET spoke exclusively with Streep at the London premiere of her new movie musical, where she dished on working with the iconic singer and teased her upcoming role on 'Big Little Lies.' 'Mamma Mia! Here We Go Again' hits theaters on July 20.

ET spoke with the cast of 'Mamma Mia! Here We Go Again' about the star power in the upcoming film, in theaters July 20.

Here's some secrets to pass the time until television's hit shows air their upcoming seasons.

ET caught up with the actress on Saturday, along with her 'Adrift' co-star, Sam Claflin. The movie hits theaters June 1.