Crystal, the Monkey and Justin Kirk Crystal, the Monkey and Justin Kirk

Justin Kirk may be on all of the posters for NBC's new comedy Animal Practice, but even he knows who the real star of the show is — industry veteran Crystal the Monkey.

Premiering Sept. 26 at 8/7c, Animal Practice marks the first regular TV series gig for Crystal, a showbiz vet known for her appearances in The Hangover Part II and Community. After 16 years of waiting for her first TV series, Crystal is enjoying every ounce of the limelight thus far playing the right-hand man monkey of misanthropic vet Dr. Coleman (Kirk). But is Crystal enjoying the spotlight a little too much? "She's got a little power. She's getting a little diva-y around here," says co-star Tyler Labine.

Animal Practice's monkey business overshadows human business

Adds executive producer Scot Armstrong: "Hollywood attitudes are hard to deal with. She's very demanding. She insists on having a trailer that's exactly one foot wider than Will Smith's trailer."

However, it seems no matter how big Crystal's head gets, it's hard to hold a grudge. As star JoAnna Garcia Swisher points out, "Who doesn't love a monkey in scrubs?"

Watch this first look video from Animal Practice to get the behind-the-scenes dirt on Crystal's first day on the job and life off the set:

Animal Practice premieres Wednesday, Sept. 26 at 8/7c on NBC.