Bradley Cooper isn't the only Hollywood actor who prefers much younger women. Joaquin Phoenix, 39, is dating Allie Teilz, who is just 19. Their relationship was made public this week when Phoenix spent time with her in Rome. He is currently on break from promoting his latest movie, "Her."

It's unclear how long Phoenix and Teilz have been dating, but they're already starting to dress alike, wearing matching Converse trainers during their time together. Teilz is from Arizona, and has been DJing since she was 16 alongside notable names including actor Elijah Wood.

Phoenix previously dated Heather Christie for a little over a year, and in the '90s he dated Liv Tyler for a number of years.

Fellow actor Cooper, 38, has also drawn attention for his relationship with model Suki Waterhouse, who's 17 years his junior. Cooper previously denied being romantically involved with his “Silver Linings Playbook” co-star Jennifer Lawrence, 22, saying he was “old enough to be her father.”

Cooper previously dated Renee Zellweger, 43, and was married to Jennifer Esposito in 2007 for four months. “It was just something that happened," Cooper later explained to Howard Stern about their short marriage. “The good thing is, we both realized it.”

Waterhouse previously dated Last Shadow Puppets singer Miles Kane.