Alexandra Daddario

They've opened up shop and welcomed their first customer with Grammy winner Cee Lo Green. Now Adam and Crosby's burgeoning business is getting a receptionist on Parenthood. Enter, Rachel (Alexandra Daddario).

"She's a young girl who is sort of figuring out her life and really wants to go into the music business," Daddario tells TVGuide.com of her multi-episode arc starting on Tuesday's episode (10/9c, NBC).  "She comes in and she sort of causes a little bit of drama for Adam (Peter Krause)."

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Rachel joins the recording studio team after dropping out of graduate school to pursue her dream of working in the music industry full time. "It was just sort of a realization that as she got older — she wanted to pursue her passion and not pursue something that she thought she had to," she says. "It's really wonderful to play a character that's so driven and knows what she wants as far as her career and I identify with that as well and sort of the fears that come with changing your path."

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The role has allowed Daddario the chance to tap into some of her own experiences both on-screen and off-screen, thanks to the sometimes improvisational nature of shooting. "Sometimes Dax [Shepard] will throw things out that you don't expect and sometimes your natural reaction is better than anything you could think up," she says. "I have a background in improv a little bit. Just from studying acting, I did a lot of improv growing up. I find it sort of interesting what can come out when you're not thinking and that's a lot of fun."

But if her character is causing trouble, how long will Daddario last? Rachel will meet other members of the Braverman clan in episodes to come, but as for her long-term employment at The Luncheonette, Daddario is uncertain. "I think she could [stick around]. The character is very, very passionate about what she's doing and she's in it for the right reasons," she says. "Beyond that, I'm not quite sure what's going to happen."