Justin Bieber has a new woman on his arm!

The singer has been seen hanging out with model Sofia Richie — a.k.a. Nicole Richie's little sister — and fans quickly took notice of the surprising age difference between the two.

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Fans were shocked to learn the model was only 17 — she turns 18 Aug. 24. Meanwhile, Justin celebrated his 22nd birthday in March.

justin bieber and sofia richie
Splash News

The two have been hanging out very frequently in the past week, and they recently jetted to Japan just two weeks before her birthday.

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Justin is known as a bit of a playa in Hollywood, and since his split with Selena Gomez, he has been linked to Hailey Baldwin, Kourtney Kardashian and Chantel Jefferies.