Amanda Bynes is spreading a lot of hate on Twitter as of late. For one, a lot of celebrities have made it to Bynes' "ugly" list. From Justin Bieber to Rihanna, here are all the celebrities Amanda Bynes has happened to diss on the social networking site.

Since Amanda's DUI incident late last year, things have gone south for the former Nickelodeon star. To date, Bynes has been involved in a bong incident to being kicked out of her apartment. Yet, none of these incidents seem to faze Bynez because she's apparently busy in her own world.

Donning an oversized blonde wig and multiple piercings, Bynes has a penchant for calling off celebrities on Twitter. Bynes' favourite word nowadays is ugly and some not-so lucky Hollywood stars get named as one simply for being on the site.

Miley Cyrus, Rihanna, Justin Bieber are just three of the famous celebrities Bynes has managed to diss on Twitter. Unlike Miley and Justin who have been nothing but nice towards Bynes since the "ugly" incident, Rihanna had exploded over Twitter fuelling an even bigger fight with Amanda.

"Chris brown beat you because you're not pretty enough," wrote Bynes to RiRi.

Other celebrities Amanda Bynes had called "ugly" also include Chrissy Teigen, Jay-Z, Drake and Lance Bass. While this may appear funny for what's left of Bynes' fan base, psychologists dub Byne's behaviour as a call for attention. Given Bynes' career is nowhere near successful, the former Nickelodeon star is doing everything she can to get back on the radar even if it means pissing off a few people.

Check out the slideshow to see all the Hollywood celebrities Amanda Bynes has managed to diss.

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