Amanda Bynes Tweets Miley Cyrus 'UR Ugly'

Cyrus responds that "I was rooting for a comeback until you started attacking me."
2:17 | 06/13/13

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Transcript for Amanda Bynes Tweets Miley Cyrus 'UR Ugly'
The twitter battle between amanda bynes and miley cyrus, miley mostly stayed mum but something is churning. Paula is here with more. When we talk about amanda bynes we talk about her recovery, and this attack le leading many to questions is it a publicity stunt or something darker? Amanda bynes is back at it again. Her latest twitter attack targeting fellow child star miley cyrus. Early wednesday, bynes tweeting cyrus, you're ugly. And attaching this photo. Later that morning, 20-year-old cyrus was asked about bynes's internet insult on washington's hot 99.5. I don't even entertain that thought. I think it's all so sad that i don't want to add fuel to that fire. Reporter: But moments later, cyrus did just that. It's really so sad to me and you know, I was rooting for a comeback until you start attacking me. Reporter: Cyrus' new single has been a hot topic of conversation online. Leading cyrus to question whether bynes's online anger is a well-placed publicity stunt. It's funny because the moment you're a trending topic it's funny how many people want your name to come out of their mouth. Reporter: It's not first tie bynes used twitter to lash out, TELLY jenny McCarthy aren't you 50 years old? You look 80 compared to me. And calling courtney love the ugliest woman she'd ever seen. Behavior doesn't stop until number one someone in power and responsibility steps in, either parents or conservatorship or they hit rot bock bot to ttom. Reporter: She's been in a seemingly downward spiral for months but could this be an attention grabbing stunt tore a project she has in the works? Thrn mog some are wondering after bynes cryptically tweeted I'm so look forward to recording my album and going on tour. Kant wait to see you all at my concerts. We should mention that amanda since are moved that mean twitter post about miley cyrus. Small step forward there. Thanks. Coming up, turn your wedding

This transcript has been automatically generated and may not be 100% accurate.

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