The former Nickelodeon star, who once shred the screen space with Efron in the 2007 musical-movie adaptation of 'Hairspray', later deleted the post, reported E! online.
"Zac Efron has an ugly face," she posted.
The post came on Bynes' wall just 12 hours after she called her sister, Jillian, 'ugly' as well.
"My sister Jillian has an ugly face. Don't worry Drake," she tweeted.
Efron and Jillian are the latest stars to fall victim to Bynes' social media backlash. The 27-year-old star had earlier slammed Sarah Hyland.
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