Vanessa Hudgens reportedly ‘flipped out’ when she learned that Lindsay Lohan’s younger sister had auditioned for a part in the third and final installment of ‘High School Musical.’

Sources say Hudgens, who is dating her co-star Zac Efron, doesn’t want 14-year-old Ali Lohan to get a part in the movie because she feels that a Lohan will bring drama.

“When Vanessa heard that Ali was vying for a part in High School Musical 3, she flipped. She knows Ali isn’t Lindsay, but she’s still weary of the drama the Lohan clan brings,” says an insider.

Ali has previously admitted to her strong desire to be like her older sister, whose wild partying and drinking lead to a DUI arrest and a rehab stint.

“I grew up watching Lindsay. It made me want to do what she does. Just the whole vibe. Being there, being on camera, or on-stage, with everybody listening to you…it’s so cool when people look up to you,” she said.