Amanda Bynes calls Zac Efron 'ugly face' on Twitter

Amanda Bynes has attacked her former 'Hairspray' co-star Zac Efron on Twitter and branded him an 'ugly face'.

The troubled actress later deleted the erratic post, the Mirror reported.

The star has also called Rihanna, Drake, Jay-Z and Miley Cyrus 'ugly' in her tweets.