Eat your heart out, Bieber!

Selena Gomez strutted through LAX en route to Paris Fashion Week today, and we couldn't help but notice that the "Come & Get It" singer has quite the perky booty! When did she fill out her figure? Whatever she's doing, she's starting to look like a member of the Kardashian clan, and we bet The Biebs wishes he hadn't kicked her to the curb.

The brunette beauty's new boyfriend Zedd is said to already be head over heels for her, but he might want to slow down, seeing as there are rumors she can't seem to kick her Bieber fever.

"Zedd thought that if he showered Selena with the attention and love that Justin didn’t – she would realize that he was the real deal. But, instead, Selena is just using their relationship to try and make Justin jealous, which stings. She has been stalking Justin and all of his friends online – and she talks about him all day long. Selena still has Google alerts on Justin, and she spends hours reading articles about him on the internet," a source dished to Celebrity Dirty Laundry.

The heart wants what it wants, and hers apparently wants JB!