"Hayden went from an A cup to a C cup and she couldn’t be happier," a close pal revealed. "She’s wanted bigger boobs since she was 17, but the timing and scheduling were just never right. She finally decided to do it right after the holidays."

Hayden recently changed her hair from blonde to red -- and it may be she’s trying to take the focus off her newly enhanced figure, says Dr. Anthony Youn, director of YOUN plastic surgery in Troy, MI.

"It appears she may have had her hair dyed as a way to attract attention away from a possible breast augmentation," Dr. Youn, who has not treated the star, told The Enquirer. "Her breasts appear to have gone from an A to a C, judging from photos." (Print Edition 2/22)