Re-posting a photo of longtime partner Ryan Gosling as Ken, Eva Mendes raved that his upcoming Barbie flick is “So. F. Funny” and “So. F. Good” Eva Mendes couldn’t be prouder of her doll Ryan Gosling. The 48-year-old actress raved on Instagram Wednesday about her longtime partner’s transformation into Ken for the upcoming Greta Gerwig-directed live-action Barbie movie, also starring Margot Robbie …