Los Angeles - Sir Elton John says Lady Gaga "baths and sings to" his children.
The Applause singer is godmother to Elton and his husband David Furnish's sons, Zachary, two, and seven-month-old Elijah, and Gaga is very hands-on in her role.
He revealed: "She (Gaga) does baths and sings to them. She's a wonderful godmother."
While Elton has nothing but praise for "good girl" Gaga - real name Stefani Germanotta - for her dedication to his children, he worries she has a tendency to get too involved with fame and being outrageous and it is something he has discussed with her mother Cynthia Germanotta.
'A great role model'
He explained: "Stefani takes it seriously and she's a good girl, but she has the problem of being caught up in the personality cult, it's so crazy. I talk to her mum a lot about it."
When it was revealed Gaga was going to be godmother to Zachary, the 66-year-old star described her as an ideal "role model".
He previously said: "She's a great role model, she's young, [and] she's been a great godmother to Zachary. We're all bonkers in this business, but we're human beings at the same time."