It looks like the claims Justin Bieber‘s alleged baby mama Mariah Yeater is making are starting to get under the pop star’s skin.

PHOTOS: Mariah Yeater Gets Motherly: “My Baby Has Justin Bieber’s Nose!”

The 17-year-old “Pray” singer was snapped in London last night on his way to dinner at Mr. Chows with friends and a mystery blonde. While up the stairs, Justin was caught flipping the bird to the paps like a total badass!

To quote Fabolous, “Y’all know who, keeping it gangsta!”

Justin has plans to take a paternity test, but no plans on meeting his would-be son.

Justin said, “I wouldn’t waste my time.” Later adding, “These people are not worth my thought or time.”

Mariah Yeater seems to be claiming more and more that Justin IS the father of her baby in interviews and statements released through her lawyer.

It’s no wonder Justin has a bit of anger to release!

STORY: Whoa! Did Justin Bieber Just Call Mariah Yeater A B*tch?

We hope Justin stays strong through the allegations and gets this matter settled soon.

Check out the pictures of Justin flipping the bird and going out to dinner in the gallery.

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