The 23-year-old "Dangerous Woman" hitmaker, who starred alongside the American-born star in the Broadway musical, joined him at the bash, which was held at Red O restaurant in Newport Beach, California, reported E! Online.
The duo was spotted enjoying a meal with a close friend in the restaurant.
Meanwhile Phillips took to Instagram to share the picture of himself with Grande and the close friend along with a caption, "Lil 13 reunion".
The pair parted ways back in December 2011.
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