03/02/2007 at 04:00 PM EST
Brooke Shields is reaching out to Britney Spears, who is currently in rehab
"I hope she's fine," Shields, 41, tells TV's Access Hollywood
in an interview to air Monday. "I believe she's going to be fine, and she just needs the support and her kids. She's their only mom, and she'll earn that back in her own mind."
Shields, who suffered postpartum depression after the birth of her first child, says that if Spears – mom to Sean Preston, 18 months, and Jayden James, 6 months – is suffering from the condition as some have speculated, "then it really needs to be reckoned with, and it's very common, and she'll get through it."
Shields, the mother of two daughters, Rowan, 3, and 10-month-old Grier, wrote the book Down Came the Rain: My Journey Through Postpartum Depression
detailing her experience and how she overcame it.
"If [Britney] is reading my book," Shields adds, "I hope it's helping her. If it's not, and she wants to talk to someone, I'm available."
Shields, who like Spears has been a public figure since she was a child, says the constant pressure of being in the media spotlight may have contributed to the singer's trouble. "[She is] followed every moment of her life, and she's documented every minute of her life."