Just when Chloe Moretz's 16th birthday bash seemed like it couldn't get any sweeter, the starlet received an extra special surprise.
Julianne Moore unexpectedly arrived with her son, Caleb, to help honor her on-screen daughter in the upcoming Carrie remake, a source tells PEOPLE.
Nearly 200 guests – including Moretz's four brothers and mom, and Sarah Hyland and Victoria Justice – were in attendance at the Teen Vogue-sponsored soiree held at the Aéropostale Times Square in N.Y.C.
Guests listened to a live performance by Icona Pop, while the birthday girl's new campaign for the clothing line was revealed.
Says the source, "Chloe and her friends were on their feet dancing into the night."
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