Helen Mirren To Amanda Bynes, Lindsay Lohan: 'Don't Be Up Your Own Bum' (VIDEO)

Screen legend Helen Mirren has some stern advice for Amanda Bynes and Lindsay Lohan.

When asked what she would tell the troubled starlets and other young wayward celebrities in a recent interview with Joelle Garguilo, Mirren, who is currently promoting her upcoming film "Red 2," was brutally frank, saying:

"I don't know if you're allowed to say this on television: Don't be up your own bum ... People get up their own [bum], and you really don't need to. It's the thing of the young, and just don't do that."

Bynes and Lohan have been making headlines in recent months for all the wrong reasons.

Other than prompting feuds with other celebs, Bynes has been raising eyebrows with her erratic behavior and bizarre tweets of late; Lohan, on the other hand, was sentenced to 90 days of "locked-down" rehab earlier this year for reckless driving in June 2012.

Infamous for her hard-partying ways, Lohan, who checked herself into rehab in May, is said to be "terrified" of relapsing into addiction once she's out in the world again, according to TMZ.