Zac Efron Responds To Amanda Bynes "Ugly" Comment On Twitter; Hunky Zac Is So Classy![VIDEO]

Amanda Bynes went to Twitter this morning to criticize Zac Efron! Amanda wrote on Twitter that Zac "has an ugly face." Hunky Zac Efron needs to stop by Amanda Byne's apartment {or some cardboard box} with a mirror because Amanda's face keeps getting stranger. Classy Zac has responded...by saying nothing to nutjob Bynes.

Amanda Bynes has clearly attacked lots of celebrities on Twitter...but Zac Efron! The face of Zac happens to be one of the cutest in the biz, but even if he was ugly, these two used to work together!

Zac and Amanda co-starred in Hairspray and seemed to get along miraculously. So why would she slam him via Twitter? Well, Bynes has been know to call a lot of people ugly on her Twitter page...

Bynes tweeted Miley Cyrus on Twitter saying "ur ugly" with a recent photo of the singer, a week after she tweeted her fiancé Liam Hemsworth saying he's "the most gorgeous man on the face of the earth," sparking rumors that she's on the prowl, again.

And then she hit Rihanna!

"@rihanna Chris Brown beat you because you're not pretty enough," she posted in a deleted message on her Twitter account. E! Online has the screenshots of the original posts.

The actress went on to criticize Rihanna further . "@rihanna no one wants to be your lover so you call everyone and their mother that I almost named my new dog Rihanna."

Does Amanda only know the word 'ugly?'