As Miley Cyrus prepares to celebrate her 16th birthday, it seems her old age and relationship with 20 year old underwear model Justin Gaston have had a negative affect on her relationship with Emily Osment.

According to reports at Star Magazine Miley has been distant with her former BFF and co-star in her upcoming film Hannah Montana: The Movie. A source told the magazine, "Things are so chilly between Miley and Emily, icicles form every time they have to speak to each other."

Miley Cyrus celebrates her 16th birthday on November 23.

Hannah Montana: The Movie is being produced by and stars Miley Cyrus' father, Billy Ray Cyrus. The film opens in American theaters on April 10, 2009.

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