Pamela Anderson, 55, wrote a private letter to Britney Spears, 41.
Anderson referred to the struggles both she and Britney have faced over the years.
Britney praised Anderson and her sons in an Instagram post.
Anderson has recently released a memoir and a documentary about her life.
Britney expressed her admiration for Anderson and her children's support in her now-deleted post.
Britney talked about her past and the difficulties she's been through.
Britney revealed that she's been through a 13-year conservatorship run by her father.
Britney discussed the recent documentaries about her life and said that they were extremely embarrassing.
Britney suggested that the documentaries felt "semi-illegal".