Bella Thorne was bound to have a blast on her 18th birthday -- and so was her chest.
Bella showed up at Beso Restaurant in Hollywood ... sporting leather (mini-skirt) and a laced up top ... to celebrate adulthood with friends.
Her 23-year-old BF Gregg Sulkin was also there, because while it was Bella's big night ... it was even bigger for him. Just guessin'.
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