Pop star Britney Spears‘ parenting skills have been called into question by a celebrity rabbi who worries her constant partying is having a devastating effect on her two young sons.

New York spiritual leader and author Rabbi Shmuley Boteach has written an open letter to the newly single star urging her to spend more time at home with kids Sean Preston and Jayden James.

He insists recent pictures of her drunk and panty-less emerging from nightclubs could scar the young pair for life.

Boteach advises, "Once you become a parent, Britney, life gets really serious… We can all pretend that life is one big party devoid of responsibility.

"And rarely being home, or coming home drunk, or letting your kids see you in a degraded state, will permanently scar your kids.

"Soon your boys will be surfing the internet. They’ll see a lot of photos of you in poses that no son should ever see their own mother… Try and be home with your kids… Cover up… Limit the visits to the nightclubs."