Taking to Instagram, the 19-year-old star shared a photo of the two getting cozy.
"Happy birthday Gregg!!! I love you. Always been such a wonderful person. Glad we are here through thick and thin. Let's party you old man," she wrote in the caption.
In the picture, the teenager is seen draped over Gregg's back as he lies on his front, eyes closed.
The pair, who appeared alongside Selena Gomez in Disney's "Wizards of Waverly Place" - split in August last year after dating for more than a year.
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