United Kingdom, May 12 -- Sienna Miller "couldn't be more proud" of Emily Blunt.

The 44-year-old actress has lavished praise on Emily, her showbiz pal, observing that "her career is extraordinary".

Speaking to Extra, Sienna explained: "I couldn't be more proud.

"She was in London last week for the premiere and she came over ... I just think that her career is extraordinary.

"Her soul is even more extraordinary. She just is the most talented human being, the greatest actress, but more than that, she's the most extraordinary friend, wife, mother, and she just brightens up all of our lives."

Sienna described Emily, 43, as "one of [her] best friends".

The actress also loved working with John Krasinski, Emily's husband, on Jack Ryan: Gho...