She’s NOT the only apple of Kim Kardashian’s eye.

Since the arrival of baby Saint West less than a week ago, Kim and Kanye’s daughter, North, is reportedly not too happy with the family's new addition!

“North already seems incredibly jealous of him because she is used to being her mother’s only one,” a source revealed to Radar Online.

RELATED: Khloé Kardashian Dishes on Saint West in New Video

kim kardashian and north west

Of course, the sibling rivalry shouldn't come as a surprise. Just a few weeks prior, Kim admitted her two-year-old daughter has a tendency to feel a little super envious if she doesn't have her mother's complete and undivided attention. (Sound familiar, Kim?)

She said, “She has a hard time when I hold other babies but she’s been getting a little bit better and I’m hoping that with her brother it’s a whole new experience.

We hope so too — for your sake!