Beastie Boys member Adam Horovitz, perhaps better known as his moniker AD-Rock, is reportedly in talks to join the cast of new film from writer/director Noah Baumbach. The indie film While We’re Young features Ben Stiller and Naomi Watts as an older couple who befriend a twentysomething hipster couple in New York. Baumbach is known for his dark indie comedies like Greenberg and The Squid and the Whale, his collaborations with Wes Anderson and even wrote the script for the animated blockbuster Madagascar 3 …